未免: rather too, a bit much
【高43】副词 / adverbs (语气)
Tone colorsā tone 1á tone 2ǎ tone 3à tone 4a neutral
未免 voices a mild criticism: what has just been seen or said goes beyond the proper limit, "that's a bit much", "isn't that rather too…?". It sits after the subject, before the judgement, almost always reinforced by 也 and 太 (未免也太 + adjective + 了) or by 过于 / 有些: 这道题未免也太难了吧. A final 吧 softens the reproach further.
It always judges an excess: never praise, never a bare statement of fact. So it needs a degree or an attitude to assess (太难, 过分, 不公平). The tone stays polite and restrained, that of someone who criticises without losing his temper; the word is common in speech and in writing alike.
Difference from 太……了 (hsk1-g37): 太好了 can express admiration, whereas 未免 only judges that the measure is overstepped.
Examples
这道题未免也太难了吧！
Zhè dào tí wèimiǎn yě tài nán le ba!Isn't this problem rather too hard?
你这样说她，未免也太过分了。
Nǐ zhèyàng shuō tā, wèimiǎn yě tài guòfèn le.Speaking of her like that is really going a bit too far.
才第一次见面就问人家的工资，未免太没礼貌了。
Cái dì yī cì jiànmiàn jiù wèn rénjia de gōngzī, wèimiǎn tài méi lǐmào le.Asking someone's salary at a first meeting is rather impolite.
为了一点小事就辞职，未免过于冲动了。
Wèile yìdiǎn xiǎoshì jiù cízhí, wèimiǎn guòyú chōngdòng le.Resigning over a trifle is rather too impulsive.
把所有的责任都推给新来的同事，未免有些不公平。
Bǎ suǒyǒu de zérèn dōu tuī gěi xīn lái de tóngshì, wèimiǎn yǒuxiē bù gōngpíng.Pushing all the blame onto the new colleague is somewhat unfair.
房租一下子涨了一半，这未免也太不近人情了。
Fángzū yíxiàzi zhǎng le yíbàn, zhè wèimiǎn yě tài bú jìn rénqíng le.Putting the rent up by half in one go is surely a little heartless.
Common mistakes
✗ 这道菜未免好吃。 → ✓ 这道菜好吃极了 (未免 only criticises an excess; to praise, say 好吃极了 or 太好吃了).
✗ 他未免没来。 → ✓ 他未免太不重视了 (未免 judges a degree or an attitude, not a bare fact).