想不出
xiǎng​bu​chū

to be unable to think of

  1. 想 xiǎng verb
    to think
    to think; to consider; to ponder; to reflect on a problem or idea
  2. 不 bu particle
    [potential]
    Used between a verb and its result to show that the action cannot achieve that result; used as the negative form of the 得 de potential construction
  3. 出 chū particle
    [direction/result]
    Used after a verb to indicate outward movement or that an action has reached a successful result.