依违两可 [- wéi liǎnɡ kě]have no definite conviction of one's own; be equivocal in one's attitude; be undecided; betwixt and between; cut both way; pro(s) and con(s); shilly-shally; the possibility of following or disobeying:
•¶ 在原则问题上要表明你的态度， 不要依违两可。 You must state your position on matters of principle. Don't be equivocal.