unfathomableadj.
英 ʌn'fæð(ə)məb(ə)l | 美 ʌn'fæðəməbl
中文adj. 深不可测的；无底的；莫测高深的
词根词源
unfathomable (adj.)1610s, originally in the figurative sense, of feelings, conditions, etc., from un- (1) "not" + fathomable. Literal sense attested from 1670s. Related: Unfathomably.
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