曇る

The Japanese verb 曇る (くもる - kumoru) is a quintessential word in the Japanese lexicon, primarily functioning as an intransitive verb that describes the act of becoming cloudy or overcast. At its most literal level, it refers to the meteorological phenomenon where the sky fills with clouds, obscuring the sun. However, the linguistic utility of kumoru extends far beyond simple weather reports. It is a versatile term used to describe anything that loses its clarity, brightness, or transparency. This includes physical objects like eyeglasses fogging up in a warm room, windows misting over on a cold morning, or even the surface of a mirror losing its reflection due to steam. The word captures the transition from a state of clarity to a state of opacity, making it an essential tool for describing environmental changes in daily life.

Literal Weather Usage

Used to describe the sky becoming covered with clouds. Example: 'Sora ga kumotte kita' (The sky has started to get cloudy).

Beyond the physical world, kumoru possesses a deep emotional resonance. In Japanese literature and daily conversation, it is frequently employed metaphorically to describe a person's facial expression or mood. When someone receives bad news or feels a sudden pang of sadness or anxiety, their face is said to 'cloud over' (kao ga kumoru). This usage mirrors the English expression but carries a specific cultural weight in Japan, where subtle changes in facial expression (reading the air or 'kuuki wo yomu') are highly scrutinized. Furthermore, it can describe the 'clouding' of one's voice, indicating a loss of clarity due to emotion, or the 'clouding' of a reputation or historical record. Understanding kumoru requires recognizing this spectrum from the literal atmospheric condition to the metaphorical internal state of a human being.

Physical Fogging

Describes surfaces like glass or mirrors becoming misty. Example: 'Ramen wo tabetara megane ga kumotta' (My glasses fogged up when I ate ramen).

In terms of grammatical classification, kumoru is a Godan verb (Type I). This means its conjugation follows the five-step pattern. For instance, the polite form is kumorimasu, the negative is kumoranai, and the past tense is kumotta. It is an intransitive verb, meaning it does not take a direct object. You do not 'cloud' something using kumoru; rather, something 'becomes cloudy' on its own. If you want to say you made something cloudy, you would use the transitive counterpart kumoraseru. This distinction is vital for intermediate learners to master, as using the wrong transitivity can lead to confusion about who or what is causing the change in state. The word is ubiquitous in weather forecasts, which are a staple of Japanese television and daily small talk, making it one of the first verbs learners should internalize to participate in social rituals.

The kanji for kumoru is 曇. It is composed of the 'sun' radical (日) on top and the character for 'cloud' (雲) on the bottom. This visual representation is incredibly intuitive: the sun being covered by clouds. This makes the kanji relatively easy to memorize compared to more abstract characters. In modern Japanese, while the kanji is standard, you will occasionally see it written in hiragana in very informal contexts or children's books, but for most adult communication, the kanji is expected. Whether you are describing the gloomy weather in June during the rainy season (tsuyu) or the look on a friend's face when they mention a difficult exam, kumoru provides the necessary nuance to describe the dimming of light and clarity in all aspects of life.

Figurative Gloom

Refers to a person's expression or a situation becoming dark or uncertain. Example: 'Kanojo no hyoujou ga kumotta' (Her expression clouded over).

Using 曇る (kumoru) correctly involves understanding its role as an intransitive verb and its various conjugations. Because it is an intransitive verb, the subject is typically marked with the particle が (ga). For example, 'Sora ga kumoru' (The sky becomes cloudy). It is incorrect to use the object particle を (wo) with this verb unless you are using the causative form. One of the most common ways you will encounter this verb is in the -te iru form, which describes a current state or a resulting state. 'Sora ga kumotte iru' means 'The sky is cloudy' (literally: the sky has become cloudy and remains in that state). This is often the most natural way to describe the current weather, rather than the simple dictionary form.

When discussing physical objects like glasses or mirrors, the verb often appears in the past tense 曇った (kumotta) to indicate that the fogging has already occurred. For instance, 'Mask wo shiteiru node, megane ga kumotta' (Because I am wearing a mask, my glasses fogged up). In this context, the verb describes a physical reaction to temperature changes or moisture. Learners should also be aware of the potential form 曇れる (kumoreru), although it is rarely used in everyday speech compared to the standard forms. More common is the causative form 曇らせる (kumoraseru), which means 'to make something cloudy' or 'to dim something'. This is often used figuratively, such as 'fuan ga kokoro wo kumoraseru' (anxiety clouds the heart/mind).

State of Being

Using ～ている to describe the current overcast condition. 'Zutto kumotteiru' (It has been cloudy the whole time).

In figurative usage, kumoru is often paired with nouns like kao (face), hyoujou (expression), or koe (voice). When you say 'Kare no kao ga kumotta,' you are describing a visible shift in his demeanor. This is an evocative way to show rather than tell emotion in writing. In more formal or literary settings, you might see kumoru used to describe the 'clouding' of a mirror as a metaphor for the loss of truth or the corruption of a soul. However, for CEFR A2 learners, focusing on the weather and fogged-up objects is the priority. Remember that while kumoru is a verb, the noun form is kumori (cloudiness/cloudy weather), which is used in phrases like 'Kumori nochi hare' (Cloudy, later sunny).

Another important aspect of using kumoru is its relationship with other weather verbs. Unlike furu (to fall - used for rain/snow), kumoru describes a change in the state of the sky itself. You might say 'Kumotte kita' (It started to get cloudy) to indicate a change you are witnessing in real-time. The auxiliary verb -te kuru is very common here because it indicates a change moving toward the present moment. This adds a dynamic quality to your Japanese, making you sound more like a native speaker who is observing the world around them. Practice these combinations to describe the ever-changing Japanese climate, especially during the volatile spring and autumn months.

Change in Progress

Using ～てきた to show the transition. 'Gogo kara kumotte kita' (It started getting cloudy from the afternoon).

The most common place to hear 曇る (kumoru) is undoubtedly the daily weather forecast (tenki yohou). In Japan, weather is a major topic of daily conversation and media. News anchors will frequently use the verb to describe upcoming weather patterns. You will hear phrases like 'Ashita wa gogo kara kumoru deshou' (It will likely be cloudy from tomorrow afternoon). Because Japan has distinct seasons and a significant amount of rainfall, tracking when the sky will 'cloud over' is essential for planning commutes, laundry (which is mostly hung outside), and outdoor activities. In this context, the word is used purely technically and literally, often in its polite -masu form or the presumptive deshou form.

In casual daily life, you'll hear kumoru in a variety of relatable situations. If you wear glasses, you will inevitably hear or say 'Megane ga kumotta!' when stepping into a hot subway car from the cold street or when sipping a hot bowl of miso soup. This is a very common 'micro-complaint' in Japanese social interaction. Similarly, in a car, someone might say 'Front glass ga kumotteiru ne' (The windshield is fogging up, isn't it?), prompting someone to turn on the defroster. These are practical, everyday uses of the word that every learner will encounter almost immediately upon living in or visiting Japan. The word is deeply embedded in the physical experience of the Japanese environment, which is often humid.

Daily Social Talk

Casual observations about the weather or fogged-up objects. 'Kyou wa kumottete samui ne' (It's cloudy and cold today, huh?).

In the realm of entertainment, such as anime, manga, and drama, kumoru takes on its more emotional and metaphorical roles. When a character's 'expression clouds over' (hyoujou ga kumoru), it is a standard trope to indicate internal conflict, sadness, or the realization of a harsh truth. You might hear a narrator say, 'Sono kotoba wo kiite, kare no me ga kumotta' (Hearing those words, his eyes clouded over). This usage adds a layer of poetic depth to the storytelling, emphasizing the connection between the external world (clouds and light) and the internal human experience. It is a word that bridges the gap between the mundane (weather) and the profound (human emotion).

Finally, you might encounter kumoru in more specialized contexts, such as photography or optics. A photographer might complain that their lens is 'cloudy' (lenzu ga kumotteiru) due to fungus or condensation, which ruins the clarity of the shot. In traditional crafts, a mirror that has lost its shine is said to have 'clouded.' Across all these contexts—from the high-tech weather satellite reports to the emotional climax of a romantic drama—kumoru remains the go-to verb to describe the loss of clarity. Recognizing its sound and kanji will help you navigate both the physical environment and the social atmosphere of Japan with greater ease.

Literary/Dramatic Use

Describing a shift in mood. 'Kare no koe ga wazuka ni kumotta' (His voice clouded slightly [with emotion]).

One of the most frequent errors English speakers make with 曇る (kumoru) is confusing it with its noun form 曇り (kumori). In English, 'cloudy' is an adjective, and we say 'It is cloudy.' In Japanese, you can say 'Kumori desu' (It is cloudiness/cloudy weather) using the noun, or 'Kumotte iru' (It is in a state of having become cloudy) using the verb. Beginners often try to treat kumoru like an adjective, saying things like 'Sora wa kumoru desu,' which is grammatically incorrect. You must choose between the noun + desu or the verb in its appropriate conjugated form. Understanding that kumoru is an action (the process of becoming cloudy) is key to avoiding this mistake.

Another common pitfall is the misuse of transitivity. As mentioned before, kumoru is an intransitive verb. English speakers often want to say they 'clouded' something, like 'I clouded the mirror.' In Japanese, if you use kumoru, you are saying the mirror did it itself. To express that you caused the clouding, you must use the causative form kumoraseru or a different verb entirely. For example, if you breathe on a window to fog it up, you are 'clouding' it (kumoraseru). Using kumoru in this context would sound like the window just happened to fog up on its own. This distinction is a hallmark of moving from beginner to intermediate Japanese proficiency.

Transitivity Error

Confusing 'Something clouds' (kumoru) with 'Someone clouds something' (kumoraseru).

A third mistake involves the nuance of 'foggy' vs. 'cloudy.' While kumoru can describe glasses fogging up, the word for 'fog' as a weather phenomenon is kiri. If the ground-level air is thick with mist, you would say 'Kiri ga deteiru' (Fog is out) rather than 'Sora ga kumotteiru.' Kumoru specifically refers to clouds in the sky or the misting of a surface. Using kumoru to describe a thick morning fog on the ground might be understood, but it isn't the most natural choice. Similarly, don't confuse kumoru with yogoreru (to get dirty). If your glasses are blurry because of fingerprints, they are yogoreteiru, not kumotteiru. Kumoru is strictly for moisture or cloud-like opacity.

Finally, learners sometimes struggle with the aspect of the verb. Kumoru (dictionary form) usually refers to a future event or a general habit ('The sky becomes cloudy in the afternoon'). To describe the current state you see when looking out the window, you almost always need the -te iru form: kumotte iru. Saying 'Sora ga kumoru' while pointing at a gray sky sounds like you are predicting it will become cloudy, even though it already is. Mastering the difference between the 'change of state' and the 'resultant state' is crucial for using kumoru naturally in conversation. Pay attention to how native speakers use the past tense kumotta to mean 'it has become cloudy' (and thus it is cloudy now).

Aspect Confusion

Using the dictionary form 'kumoru' to describe a current state instead of 'kumotte iru'.

While 曇る (kumoru) is the standard term for becoming cloudy, Japanese offers several alternatives that provide more specific nuances. One such word is どんよりする (donyori suru). This onomatopoeic verb describes a heavy, leaden, and gloomy sky. While kumoru just says it's cloudy, donyori suru conveys a sense of oppressiveness, as if the clouds are thick and dark and might stay for a long time. It is often used to describe the atmosphere of a rainy season day or a person's very dark mood. Another alternative is 翳る (kageru), which means to become shadowed or dimmed. This is a more literary term often used when the sun goes behind a cloud, causing the light to fade.

For the physical fogging of glass, you might encounter 結露する (ketsuro suru). This is a more technical/scientific term meaning 'to condense.' While you would say your glasses kumoru, you might say the windows of a house ketsuro suru in the winter. Another related word is 霞む (kasumu), which means to be misty, hazy, or blurred. Kasumu is often used for distant mountains in the spring (haru-gasumi) or for one's vision becoming blurry due to tears or fatigue. While kumoru implies a solid blockage of light (like a cloud), kasumu implies a thin, translucent veil that makes things hard to see clearly.

Comparison: Kumoru vs. Kasumu

Kumoru is for clouds or fogged glass (opaque); Kasumu is for haze or misty vision (translucent).

In emotional contexts, instead of kao ga kumoru, you might use 沈む (shizumu), which means 'to sink.' A person with a shizunda kao (sunken face) is deeply depressed or melancholy, whereas a kumotta kao suggests a sudden darkening of mood due to a specific thought or event. Another expressive alternative is 暗くなる (kuraku naru), which simply means 'to become dark.' This is very common in casual speech: 'Kare no hanashi wo kiite, kimochi ga kuraku natta' (Hearing his story made my mood dark). Kumoru is slightly more sophisticated and visual than kuraku naru, making it a favorite for writers and news broadcasters.

Lastly, consider the word 濁る (nigoru), which means 'to become muddy' or 'to become impure.' This is used for liquids (like water becoming cloudy with dirt) or for sounds/voices that aren't clear. While kumoru describes a voice muffled by sadness, nigoru describes a voice that is raspy or a heart that has become 'impure' or 'corrupted.' Choosing between kumoru and nigoru depends on whether the lack of clarity is due to a 'covering' (clouding) or an 'intermixing' (muddying). Mastering these distinctions allows you to describe the world with the precision and poetic sensitivity that is highly valued in Japanese culture.

Comparison: Kumoru vs. Nigoru

Kumoru: Clouding of sky/glass/mood (external covering). Nigoru: Muddying of water/sound/heart (internal impurity).