禁諗 [－谂]

Jyutping kam1 nam2
Pinyin jìn shěn

Definitions (CC-CANTO)
  1. (verb) rack one's brains; spend great effort thinking about
Definitions (粵典–words.hk)
  1. x
Definitions (Kaifangcidian)
  1. 費腦筋 – 费脑筋