Accidently vs. Accidentally: What's the Difference?
accidentally. The adjective is accidental, so just add -ly.
Grammar Rule in 30 Seconds
Always use 'accidentally' with two Ls and an 'al'. 'Accidently' is a common spelling error based on how we speak.
- Start with the noun 'accident'. Example: 'It was an accident.'
- Turn it into the adjective 'accidental'. Example: 'The damage was accidental.'
- Add -ly to the adjective to get 'accidentally'. Example: 'I accidentally called you.'
Overview
The distinction between accidentally and accidently represents a common challenge for English learners at the B1 level and beyond, often leading to confusion even among native speakers. While accidently is frequently encountered in informal writing and digital communications, accidentally is the unequivocally correct and standard adverbial form in modern English. Understanding this difference is crucial for effective and accurate written communication, particularly in academic, professional, and formal contexts. The misspellings stem from an incomplete understanding of how certain adverbs are formed from their root words, specifically involving adjectives that conclude with -al.
This explanation will clarify the precise grammatical process, ensuring you can confidently use accidentally in all situations.
How This Grammar Works
accidentally is rooted in the systematic way English constructs adverbs, particularly from adjectives ending in -al. Adverbs function to modify verbs, adjectives, or other adverbs, providing information about manner, time, place, or degree. In the case of accidentally, it describes how an action occurred: without intention or by chance.accident, which denotes an undesirable or unfortunate incident. From this noun, you derive the adjective accidental, meaning happening by chance or unexpectedly.-ly is typically appended. However, when the adjective itself already ends in -al, the addition of -ly results in a double l (-ally).accidental. When the adverbial suffix -ly is added to it, the l from accidental combines with the ly suffix to form accidentally. This adherence to the adjectival base is the linguistic principle that underpins the spelling.k from quick before adding -ly to form quickly; similarly, the al in accidental must be retained. This process maintains the integrity of the adjective within the adverbial form, ensuring a consistent and predictable grammatical structure.accidentally. Many other adverbs in English follow the identical rule, reinforcing its systemic nature. For example:- The adjective
incidental(meaning occurring as a minor accompaniment) becomesincidentallywhen forming its adverb. - The adjective
critical(meaning expressing adverse or disapproving comments or judgments) becomescriticallywhen forming its adverb. - The adjective
personal(meaning of, affecting, or belonging to a particular person) becomespersonallywhen forming its adverb. - The adjective
magical(meaning possessing or using magic) becomesmagicallywhen forming its adverb.
-al ending of the adjective is preserved before the -ly suffix is added. This consistent application demonstrates that accidentally is not an exception but an integral part of a broader, predictable English grammar rule. Understanding this underlying morphological process empowers you to apply the rule correctly to new words and avoid common spelling errors.l is therefore a direct consequence of this systematic formation from the adjective, rather than an arbitrary spelling convention.Formation Pattern
accidentally and similar adverbs involves a clear, three-step progression. This systematic approach ensures accuracy by building the adverb from its foundational noun through its adjectival form. Overlooking the intermediate adjective accidental is precisely where the common misspelling accidently originates.
-al.
Noun | accident | accident | accident | This is the root concept, referring to an unintended event. For instance, The car crash was a terrible accident. |
Adjective | accident + -al | accidental | accidental | The suffix -al transforms the noun into an adjective, describing something that relates to an accident or happens by chance. Example: An accidental discovery. |
Adverb | accidental + -ly | accidentally | accidentally | The suffix -ly is added to the adjective, yielding an adverb that modifies a verb, indicating an action done without intention. Example: She accidentally deleted the file. |
Adjective ending in -al + -ly formula.
-al, to form its corresponding adverb, you simply append -ly. The final adverb will thus always contain the sequence -ally.
Noun: incident → Adjective: incidental → Adverb: incidentally (e.g., The problem was incidental to the main issue.)
Noun: logic → Adjective: logical → Adverb: logically (e.g., He responded logically to the question.)
Noun: nation → Adjective: national → Adverb: nationally (e.g., The product is sold nationally.)
...al before adding -ly is what differentiates correct adverbs like accidentally from common misspellings. It highlights that the ll in accidentally is not a random duplication but a direct consequence of English morphological rules. By internalising this three-step process and the -al + -ly rule, you can accurately construct a wide range of adverbs and avoid this particular spelling pitfall. Always remember that the adjective is the direct progenitor of the adverb in these instances.
When To Use It
accidentally as an adverb to describe an action that occurs by chance, without conscious intent, or as an unintended consequence. It modifies verbs, indicating how an action was performed. While accidentally can technically modify adjectives or other adverbs, its primary and most frequent function is to describe the manner of a verb's action.accidentally spill coffee on your notes, it conveys that the spilling was not a deliberate act but an unplanned mishap. The focus is on the unintentional nature of the action.accidentally in modern communication:- Describing physical mishaps: "I
accidentally droppedmy phone in the water." Here,droppedis the verb, andaccidentallymodifies it, explaining the manner of the dropping. This implies a lack of control or an unexpected event. - In digital communication (texts, emails): "Oops, I
accidentally replied allto that email instead of just the sender." This highlights a common digital error where an action (replying) occurred contrary to the user's intent. Similarly, "Did youaccidentally muteyour microphone during the video call?" queries whether an action was performed without awareness. - Explaining unintentional outcomes: "She
accidentally discovereda new method for solving the problem while working on something else." The discovery was a fortuitous, unplanned event, not a result of direct pursuit. - In apologies or explanations: "I
accidentally packedyour charger with my things; I'll return it tomorrow." This phrase mitigates blame by emphasizing the lack of intention behind the action.
by accident:accidentally is functionally interchangeable with the prepositional phrase by accident. Both convey the same meaning of an action occurring unintentionally.accidentally | Adverb | I accidentally broke the vase. | accidentally directly modifies the verb broke. |by accident | Prepositional Phrase | I broke the vase by accident. | by accident functions adverbially, modifying broke. |accidentally is a single word, often making it more concise and preferred in formal writing or when striving for stylistic efficiency. In casual speech, by accident can sometimes feel slightly more emphatic, but this is a subtle nuance. The choice between them often comes down to personal style or rhythmic preference in a sentence.by accident to modify an adjective or another adverb; its scope is primarily verbal. For example, you would not say an by accident discovery. You would use the adjective form an accidental discovery.accidentally is the precise and correct adverbial choice, applicable across a spectrum of communication styles and contexts. It is a fundamental adverb for describing the unforeseen aspects of human action and natural occurrence.Common Mistakes
accidentally can significantly enhance your accuracy and confidence. Learners often encounter specific challenges due to phonetic similarity, overgeneralization of rules, or a lack of awareness of the nuanced morphological processes in English.- 1Spelling
accidently: This is by far the most prevalent error. The mistake arises from adding the adverbial suffix-lydirectly to the nounaccidentinstead of to the adjectiveaccidental. Many learners, and even some native speakers, intuitively hearaccidentand then add-ly, bypassing the critical-alstep.
- Incorrect:
Iaccidentlydropped my keys.(Missing thealfromaccidental.) - Correct:
Iaccidentallydropped my keys.(Retains thealfromaccidentalbefore adding-ly.) - Why it's a mistake: English adverb formation from adjectives ending in
-aldemands the retention of that adjectival suffix. Thellinaccidentallyis not extraneous; it is morphologically necessary.
- 1Using
accidental(adjective) whenaccidentally(adverb) is required: Another frequent error involves confusing the grammatical function of the adjective and the adverb.Accidentaldescribes a noun, whileaccidentallydescribes a verb (or an adjective/adverb).
- Incorrect:
She found the solutionaccidental.(Here,accidentalis incorrectly used to modify the verbfound.) - Correct:
She found the solutionaccidentally.(The adverbaccidentallycorrectly describes how she found the solution.) - Correct (using adjective):
It was anaccidentalfinding.(The adjectiveaccidentalcorrectly describes the nounfinding.) - Why it's a mistake: This error often stems from a general difficulty in distinguishing between parts of speech and their appropriate roles in a sentence. Always ask: "Is this word describing a thing (noun) or an action (verb)?"
quickquickly, soft → softly) directly to accident. This leads them to assume that only a single l is needed. However, the rule specifically for adjectives ending in -al (-ally) is distinct and must be memorized or understood as a separate pattern.- Incorrect Reasoning:
accident+-ly=accidently(Analogous tosad+-ly=sadly). - Correct Reasoning:
accident→accidental(adjective) →accidental+-ly=accidentally(adverb). - Why it's a mistake: Failing to recognise that English morphology is not always uniform and has specific patterns for different word endings.
accidental) and the consistent -al + -ly pattern. Practising with similar words like critical/critically and incidental/incidentally can help solidify this understanding. When in doubt, a quick mental check for the presence of the full -al from the adjective before the adverbial -ly will prevent most misspellings.Real Conversations
Accidentally is a ubiquitous adverb in everyday English, appearing naturally across a wide spectrum of communicative contexts, from casual banter to more formal discussions. Observing its use in authentic scenarios helps to internalize its meaning and application beyond mere grammatical rules. It often serves to mitigate responsibility, express surprise, or simply describe an unforeseen event without blame.
Scenario 1
Student A
Student B
accidentally delete the draft section I was working on last night? My document history looks weird."Student C
accidentally do when you're tired."Here, accidentally delete and accidentally do clearly convey the unintentional nature of the actions, alleviating immediate concern and suggesting a simple error rather than negligence.
Scenario 2
Subject
Dear Team,*
My apologies for the slight delay in circulating these. I seem to have accidentally saved the initial draft to my personal drive instead of the shared project folder. I've now uploaded the correct version to the team repository. Please review at your convenience.*
Best regards,*
Liam*
In this professional context, Liam uses accidentally saved to explain a minor administrative error, subtly conveying that the mistake was unintentional and not indicative of carelessness. It's a common way to frame minor mishaps without sounding overly apologetic or self-deprecating.
Scenario 3
Friend 1
Friend 2
accidentally started watching a different one last night, thinking it was the one you meant. It was about Roman engineering, actually pretty interesting, but not the one you recommended!"Friend 1
accidentally found another good watch then!"This exchange demonstrates accidentally started and accidentally found used in a relaxed, informal manner to describe unexpected discoveries or minor confusions. The adverb highlights the unplanned nature of Friend 2's viewing experience, turning a slight misunderstanding into a positive outcome.
These examples underscore that accidentally is not reserved for grand, impactful errors but is a versatile term for describing any action, large or small, performed without conscious intention. Its consistent usage across various registers of English makes it an indispensable component of fluent communication. It allows speakers to convey nuance regarding agency and responsibility, which is a subtle but important aspect of English communication.
Quick FAQ
accidentally and accidently can raise several practical questions. Here are answers to some of the most common inquiries, providing additional clarity and reinforcement.accidently ever considered correct in modern English?No. In standard, contemporary English, accidently is universally regarded as a misspelling. While historical texts from centuries past might show instances of accidently, this usage is archaic and not acceptable in any form of modern communication, whether formal or informal. Always use accidentally.
accidently?Autocorrect algorithms are designed to learn from usage patterns. Because accidently is a very common misspelling, these systems sometimes pick up on its frequent occurrence in digital texts. This does not validate its correctness; rather, it reflects a prevalent error. Treat such suggestions as a reminder of a common mistake, not an endorsement of alternative spelling.
accidentally?Yes, the most effective memory aid is to break the word down into its morphological components and recall the intermediate adjective. Think: accident (noun) → accidental (adjective) → accidentally (adverb). Focus on the al from accidental and then adding the ly. You can visualise it as accident-AL-ly, ensuring you include both l's. Another tip is to remember the word critical and its adverb critically; the pattern critical-ly is identical to accidental-ly.
accidentally and by accident?Both accidentally and the phrase by accident convey the same meaning: without intention or by chance. They are largely interchangeable in terms of semantic content. The difference lies in their grammatical classification:
Accidentallyis a single-word adverb.By accidentis a prepositional phrase functioning adverbially.
I accidentally left my umbrella or I left my umbrella by accident. The choice often comes down to stylistic preference or sentence flow. Accidentally is generally more concise, which can be advantageous in formal or academic writing.accidently in very informal contexts, like text messages with friends?While your friends might understand you if you use accidently in a text message, it is always advisable to use the correct spelling, accidentally. Developing the habit of using the correct form consistently, even in informal contexts, will solidify your understanding and prevent errors when it truly matters, such as in academic assignments or professional correspondence. It also demonstrates attention to detail and a command of the English language.
-al to -ally pattern?Absolutely. This is a consistent rule in English morphology. Many adjectives ending in -al form their adverbs by simply adding -ly, resulting in the -ally ending. Examples include:
personal→personallyglobal→globallyfinancial→financiallyindividual→individually
accidentally and equips you with a powerful tool for forming many English adverbs correctly.From Noun to Adverb
| Noun | Adjective (+al) | Adverb (+ly) | Common Error |
|---|---|---|---|
|
Accident
|
Accidental
|
Accidentally
|
Accidently
|
|
Incident
|
Incidental
|
Incidentally
|
Incidently
|
|
Logic
|
Logical
|
Logically
|
Logicly
|
|
Music
|
Musical
|
Musically
|
Musicly
|
|
Magic
|
Magical
|
Magically
|
Magicly
|
|
Basic
|
Basical (archaic)
|
Basically
|
Basicly
|
Meanings
To do something by mistake or without intention; happening by chance rather than design.
Unintentional Action
Performing an action without meaning to do so, often resulting in a mistake.
“She accidentally stepped on my toe in the crowded elevator.”
“He accidentally left his keys inside the locked car.”
Chance Occurrence
Something happening by luck or coincidence rather than a planned event.
“We accidentally met at the train station after five years.”
“The scientist accidentally discovered the cure while researching something else.”
Euphemistic/Sarcastic
Used to describe an action that was likely intentional but presented as a mistake to avoid blame.
“Oh, did I accidentally eat the last slice of your pizza?”
“He 'accidentally' forgot to invite his rival to the party.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subject + accidentally + Verb
|
I accidentally called you.
|
|
Negative
|
Subject + did not + accidentally + Verb
|
I did not accidentally break it; I did it on purpose.
|
|
Question
|
Did + Subject + accidentally + Verb?
|
Did you accidentally delete the file?
|
|
With Auxiliary
|
Subject + have + accidentally + Past Participle
|
She has accidentally left her phone.
|
|
Passive Voice
|
Subject + was + accidentally + Past Participle
|
The window was accidentally broken.
|
|
Short Answer
|
Yes, I did (accidentally).
|
Did you trip? Yes, I did accidentally.
|
Formality Spectrum
The email was accidentally sent to the incorrect recipient. (Workplace communication)
I accidentally sent the email to the wrong person. (Workplace communication)
I accidentally hit 'send' too soon. (Workplace communication)
My bad, I fat-fingered the send button. (Workplace communication)
The Adverb Bridge
The Root
- Accident The noun (the event)
The Bridge
- Accidental The adjective (the quality)
The Result
- Accidentally The adverb (the manner)
Spelling vs. Sound
Should I use -ally?
Does the adjective end in -al?
Is the word 'Accidental'?
Examples by Level
I accidentally broke my pen.
He accidentally closed the door.
Did you accidentally eat my apple?
They accidentally went to the wrong house.
I accidentally sent the email to my boss instead of my friend.
She accidentally spilled coffee on her new white shirt.
We accidentally missed the last train home.
The cat accidentally knocked the vase off the table.
I accidentally deleted the photos from our vacation.
The two friends accidentally met in a city they were both visiting.
He accidentally revealed the surprise party to the birthday girl.
I accidentally left the oven on when I went to work.
The researcher accidentally discovered the compound's unique properties.
I accidentally insulted him by misinterpreting his cultural traditions.
The company accidentally published the confidential report on their website.
She accidentally became the spokesperson for the movement after her video went viral.
The legislation was accidentally drafted with a loophole that lawyers quickly exploited.
By accidentally omitting the crucial variable, the study's results were rendered invalid.
He accidentally stumbled upon a cache of historical documents in the attic.
The protagonist accidentally triggers a series of catastrophic events.
The diplomat's gaffe, though seemingly minor, accidentally jeopardized months of delicate negotiations.
The artist's masterpiece was born from a canvas he had accidentally left out in the rain.
One might argue that the empire was acquired accidentally, through a series of reactive skirmishes.
The software's 'feature' was actually a bug that had been accidentally integrated into the core kernel.
Easily Confused
Both end in '-ally' and sound similar. Learners often use them interchangeably.
Learners try to combine them into 'by accidentally'.
A more formal synonym that is harder to spell.
Common Mistakes
I accidently broke it.
I accidentally broke it.
It was an accidentally.
It was an accident.
I accidentaly saw her.
I accidentally saw her.
He did it accidental.
He did it accidentally.
I accidently sent the text.
I accidentally sent the text.
She accidental spilled the juice.
She accidentally spilled the juice.
Did you do it accidently?
Did you do it accidentally?
I was accidently included in the email.
I was accidentally included in the email.
It happened quite accidently.
It happened quite accidentally.
He accidently discovered the truth.
He accidentally discovered the truth.
The data was accidently corrupted.
The data was accidentally corrupted.
Sentence Patterns
I accidentally ___ my ___.
It was ___ that I accidentally ___.
While I was ___, I accidentally ___.
The ___ was accidentally ___ by the ___.
Real World Usage
I accidentally liked my ex's photo from 2014.
The database was accidentally wiped during the update.
We accidentally got off at the wrong stop.
The restaurant accidentally sent me the wrong order.
I accidentally arrived thirty minutes early for the interview.
Sorry, accidentally sent that to you!
The 'AL' Test
Spellcheck Trap
Double the L
Softening Mistakes
Smart Tips
Don't shorten it! The length comes from the 'al' bridge. Keep it long to keep it right.
Almost all -ic words (like basic, magic) need -ally, not just -ly.
Put 'accidentally' right before the verb to sound most sincere.
Count the Ls: one from 'accidental' and one from 'ly'. 1 + 1 = 2!
Pronunciation
The Silent 'A'
In fast speech, the 'a' in 'accidentally' is often not pronounced. It sounds like 'ak-si-dent-lee'.
Stress Pattern
The primary stress is on the third syllable: ac-ci-DEN-tal-ly.
Apologetic Intonation
I ↘accidentally ↗broke it.
A falling-rising tone on the word shows sincere regret.
Memorize It
Mnemonic
Remember: 'AL' is ALways there in 'Accidentally'.
Visual Association
Imagine a person named AL who is very clumsy. Every time there is an accident, AL is in the middle of it. Accid-AL-ly.
Rhyme
To spell it right, don't be shy, keep the 'AL' before the 'LY'.
Story
Once there was a man named Al who lived in a town called Accident. He did everything in an 'Accident-Al' way. When he moved, he did it 'Accident-Al-ly'.
Word Web
Challenge
Write three sentences about things you did 'accidentally' today. Check each one to ensure you have two Ls and an 'a' before them.
Cultural Notes
Using 'accidentally' is a key way to avoid social conflict. It signals that you are not a 'bad' person, just a 'clumsy' or 'forgetful' one.
British speakers often use 'by accident' more frequently than 'accidentally' in spoken conversation, though both are correct.
On social media, 'accidentally' is often used ironically to describe things that were definitely planned, like 'accidentally' posting a perfect selfie.
Derived from the Latin 'accidens' (happening), which comes from 'ad-' (to) + 'cadere' (to fall).
Conversation Starters
Have you ever accidentally sent a text message to the wrong person?
What is something you accidentally discovered that turned out to be useful?
Tell me about a time you accidentally went to the wrong place.
In your opinion, are the best things in life planned or do they happen accidentally?
Journal Prompts
Common Mistakes
Test Yourself
I ___ deleted the file.
The discovery was purely ___.
Find and fix the mistake:
She accidently left her umbrella on the bus.
Match each item on the left with its pair on the right:
The word 'accidently' is the standard spelling in American English.
spilled / I / coffee / accidentally / my
A: Why did you call me at 3 AM? B: Sorry! I ___.
Select the correct list:
Score: /8
Practice Exercises
8 exercisesI ___ deleted the file.
The discovery was purely ___.
Find and fix the mistake:
She accidently left her umbrella on the bus.
Match the following:
The word 'accidently' is the standard spelling in American English.
spilled / I / coffee / accidentally / my
A: Why did you call me at 3 AM? B: Sorry! I ___.
Select the correct list:
Score: /8
Practice Bank
12 exercisesHe ___ tripped over the cat on his way to the kitchen.
Choose the correct sentence:
The discovery was made totaly accidently during a different experiment.
Translate into English: 'The action of me pressing the button was not on purpose.'
The meeting was an ___ success; we didn't plan for it to go that well.
Arrange these words into a sentence:
Choose the correct sentence:
I'm so sorry, I must have accidently deleted your comment.
Match the words with their correct description:
The secret agent ___ let his true identity slip during the conversation.
Arrange these words into a sentence:
Translate into English: 'Was the deletion of the photos intentional or not?'
Score: /12
FAQ (8)
In modern standard English, no. It is considered a misspelling. You might see it in very old books, but you should never use it today.
Because of how we speak! We often skip the 'al' sound, so it sounds like `accidently`. People often write what they hear.
It always has two 'Ls'. This is because the adjective `accidental` ends in 'L', and we add `ly` to it.
There is no difference in meaning. `Accidentally` is an adverb, and `by accident` is a prepositional phrase. Both are correct.
Yes! For example: `Accidentally, I left my keys inside.` However, it is more common to put it before the verb.
It is neutral. You can use it in a text to a friend or in a formal business report.
In formal speech, it's a quick 'uh' sound (a schwa). In casual speech, it often disappears entirely.
Yes! `Basically`, `incidentally`, and `automatically` all follow the same rule. They all need the `al` before the `ly`.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
accidentalmente
Spanish only has one 'l' because Spanish doesn't double 'l' for adverbs.
accidentellement
The vowel before the 'l' is an 'e' in French, but an 'a' in English.
versehentlich
German adverbs often don't have a special ending like '-ly'.
ukkari (うっかり)
Japanese places the adverb before the verb without any suffix.
bi-l-sudfa (بالصدفة)
It uses a noun ('sudfa') with a preposition ('bi') instead of a suffix.
bù xiǎoxīn (不小心)
It focuses on the lack of care rather than the 'accident' itself.
Learning Path
Prerequisites
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