捉摸不定 zhuōmōbùdìng unpredictable Origin Definitions Defs Strokes Stroke Words Sentences Sents 捉摸 zhuōmō adjective to fathom to fathom; to make sense of; to grasp. Often used in the negative to indicate that something is unpredictable or hard to guess.不定 bùdìng adjective indefinite not fixed or certain; indeterminate; wandering or shifting; without a fixed result or settlement