不一

to vary / to differ

no; not so / (bound form) not; un-

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

soon

different / distinctive / unlike

by no means an isolated case / numerous

(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)

heart and mouth at variance (idiom); keeping one's real intentions to oneself / saying one thing but meaning sth different

outside appearance and inner reality differ (idiom); not what it seems / saying one thing but meaning sth different

(idiom) to say one thing and do another

not necessarily / maybe