胡思乱想
hú​sī​luàn​xiǎng HSK7

to let one's imagination run wild; imaginings

  1. 胡 hú verbnoun
    recklessly
    recklessly; randomly; without foundation
  2. 思 sī verbadjective
    to think
    (bound form) to think; to consider; to deliberate
  3. 乱 亂 luàn adverb
    rashly
    indiscriminately; at random; arbitrarily; doing something without thinking or permission
  4. 想 xiǎng verb
    to think
    to think; to consider; to ponder; to reflect on a problem or idea