感情用事

gǎnqíngyòngshì
to act impetuously (idiom); on an impulse

CEDICT

凭个人好恶和一时的情感冲动处理事情。

重編國語辭典

Entry Composition

1 感情 gǎnqíng
  1. emotion; sentiment
  2. affection; feelings between two persons
2 用事 yòngshì
  1. (literary) to hold power
  2. (literary) to use classical allusions in poetry and literature
  3. to hold power
  4. to manage affairs; to get things done
  5. to use classical allusions in poetry and literature