人心叵测 rénxīnpǒcè hard to fathom the human heart Origin Definitions Defs Strokes Stroke Words Sentences Sents 人心 rénxīn noun human mind The human mind, psyche, or innate character of a person叵 pǒ cannot (bound form) cannot; impossible. Historically a contraction of the characters 不 bù and 可 kě.测 測 cè verbnoun to conjecture (bound form) to conjecture; to infer; to guess