GbEng
他的政治观点在两个极端之间摇摆不定. He oscillates between political extremes.
要是你老这样举棋不定, 我们就来不及了. If you keep shilly-shallying like this we'll be late.
说不定他已经死了. For all I know he could be dead.
说不定他已经死了。 He may be dead for aught I know.
我想我能来，但还说不定。 I think I can come, but don't rely on it.
他对是否参加考察队仍拿不定主意. He's still hesitating about joining/over whether to join the expedition.
一定要用毛巾把孩子们彻底擦干，他们浑身湿透了，说不定会着凉的。 Do towel the children down very thoroughly, they're wet to the skin and might catch cold!
前后摇晃摇摆不定的动作或实例；不稳定的行动 The act or an instance of wobbling; unsteady motion.
不定代名词的。用于代词 Indefinite. Used of pronouns.
据说由于原材料市场上升且捉摸不定，制革商们不愿报出实盘。 The tanner is said to be reluctant to quote firm price because of a rising and uncertain raw material market.
他开汽车像个疯子--不定哪天就得撞死. He drives like a nut he'll kill himself one day.
作者似乎拿不定主意是写喜剧还是写悲剧, 致使这个剧非驴非马. The author seems uncertain whether he is writing a comedy or a tragedy, so the play falls between two stools.
黄金和白银的起伏不定的价格 The fluctuating value of gold and silver.
由于温度起伏不定，他们的测验结果很不准确。 Fluctuations in temperatures put their results oat by a mile.