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不

bu4

• no; not so
• (bound form) not; un-

不一

bu4 yi1

• to vary
• to differ

不一定

bu4 yi1 ding4

• not necessarily
• maybe

不一会

繁体：不一會

bu4 yi1 hui4

• soon

不一样

繁体：不一樣

bu4 yi1 yang4

• different
• distinctive
• unlike

不一而足

bu4 yi1 er2 zu2

• by no means an isolated case
• numerous

不一致字

bu4 yi1 zhi4 zi4

• (orthography) inconsistent words (e.g. "through", "bough" and "rough", where "-ough" is not pronounced the same in each case)
• inconsistent characters (e.g. 流[liu2], 梳[shu1] and 毓[yu4], which are pronounced differently from each other even though they all have the same notional phonetic component)

不三不四

bu4 san1 bu4 si4

• (idiom) dubious; shady; neither one thing nor the other; neither fish nor fowl; nondescript