严重

You will mostly see 严重 used to describe nouns that represent problems or conditions. It often follows the word 很 (hèn - very) or 非常 (fēicháng - extremely). You can say a problem is 严重, or a situation is 严重. It is also frequently used as an adverb to describe how someone is affected by something, like being 严重受损 (severely damaged). Remember that it is almost always negative. You wouldn't say your birthday party was 严重 unless the cake exploded and the house caught fire. It is a 'problem-centric' word. It doesn't describe people's personalities (that’s a different word!), but it definitely describes the mess people get into. If you are describing a bug in your code that crashes the whole app, 严重 is your best friend.

Imagine you are scrolling through TikTok and the app keeps crashing. You might comment, "这个Bug太严重了！" (This bug is too serious!). Or think about a weather report warning of a 严重 storm—the kind where you stay inside and order extra snacks. In a professional setting, a manager might say, "我们面临一个严重的问题" (We are facing a serious problem) during a Zoom meeting. It is also the word doctors use in those hospital dramas you binge-watch on Netflix when the patient's condition isn't looking good. Even in casual texting, if your friend ghosts you for a week, you might tell another friend, "这件事挺严重的" (This matter is quite serious), though that might be a bit dramatic for just a text!

Use 严重 when you want to emphasize that a negative situation is on a large scale. Use it for medical conditions (like a 严重 flu), environmental issues (like 严重 pollution in the city), or technical failures (like a 严重 server outage). It is perfect for formal reports or news broadcasts. If you are writing an essay about climate change, you will use 严重 constantly. If you are at a car repair shop and the mechanic looks worried, he will likely use this word. It is also appropriate for social issues, like a 严重 housing shortage or 严重 unemployment. Basically, if it is a 'big deal' and it is bad, 严重 is the correct choice. It adds a layer of professional gravity to your speech.

Do not use 严重 to describe a person's character. If your teacher is very strict, she is 严格 (yángé), not 严重. If your friend is a deep thinker and never laughs at your jokes, he is 严肃 (yánsù). Using 严重 to describe a person makes it sound like they are a medical emergency or a natural disaster! Also, don't use it for positive things. You can't have a 严重ly good time. Furthermore, avoid it for trivial things unless you are being intentionally sarcastic. If you run out of milk, saying it is a 严重 problem might get you some weird looks unless you are a competitive cereal eater. Finally, don't confuse it with 'really' (really? = 真的吗？). 严重 is about severity, not truth.

One of the biggest face-palms for learners is saying ✗ 他很严重 (Tā hěn yánzhòng) when they mean "He is very strict." That actually means "He is in a critical medical condition." Instead, use ✓ 他很严格 (Tā hěn yángé). Another classic is using it to say "I am serious" (as in, I'm not joking). If you say ✗ 我很严重, people will call an ambulance. Use ✓ 我是认真的 (Wǒ shì rènzhēn de). Learners also sometimes forget that 严重 usually needs a noun to describe. Saying ✗ 这很严重好 is grammatically messy; stick to ✓ 这很严重 (This is serious). Don't try to use it as a substitute for 'very' in a positive context, like ✗ 严重漂亮—that just sounds like her beauty is a catastrophic event.

A common cousin is 厉害 (lìhai). While 厉害 can mean 'severe' (like a 厉害 cough), it can also mean 'awesome' or 'impressive.' 严重 is never awesome. Another one is 要紧 (yàojǐn), which means 'critical' or 'important.' You might hear "不要紧" (It doesn't matter/it's not serious). 糟糕 (zāogāo) is another favorite, meaning 'terrible' or 'awful,' but it is more of an emotional reaction than a clinical description of severity. Then there is 恶劣 (èliè), usually used for bad weather or bad behavior. While all these words live in the 'bad' neighborhood, 严重 is the one wearing the suit and carrying the clipboard, measuring exactly how bad things really are.

You will often see it paired with 'consequences': 严重后果 (yánzhòng hòuguǒ). If you don't study for your HSK exam, there will be 严重后果! It also pairs with 'illness': 病情严重 (bìngqíng yánzhòng). In the news, you’ll hear about 严重威胁 (yánzhòng wēixié - serious threat), often regarding security or the environment. Another useful one is 严重不足 (yánzhòng bùzú - seriously insufficient), like when your phone battery is 严重不足 just as you’re about to call an Uber. These collocations are the 'cheat codes' to sounding like a native speaker. Instead of just saying things are 'bad,' using these specific pairings makes you sound more precise and educated.

Is 严重 formal? Yes, it is neutral to formal. You can use it with your boss or in a research paper, but it is also fine for talking about a broken leg with friends. Can I use it for 'serious' as in 'serious about a relationship'? No, for that you would use 认真 (rènzhēn). Can it be used for air pollution? Absolutely, 污染严重 is a very common phrase in Chinese cities. Does it always mean 'bad'? Yes, 99.9% of the time it refers to something negative or a problem that needs fixing. If you use it for something good, people will think you are a poet or just very confused.