不屑一顧to disdain as beneath contempt
不言而喻obvious
不約而同a coincidence;taking the same action without prior consultation
不擇手段by fair means or foul;by hook or by crook;unscrupulously
不知所措not knowing what to do;refers to an awkward or confusing situation
不自量力overrate one’s own abilities
三言兩語just a few words
草木皆兵imaginary fears (lit. every tree or bush an enemy soldier)
參差不齊non-uniformity;non-standard
層出不窮more and more emerge;innumerable succession;breeding like flies