言不由衷 yán bù yóu zhōng

DEFINITIONS

  1. to say sth without meaning it (idiom); to speak tongue in cheek
  2. saying one thing but meaning sth different

CHARACTERS

言 yán words, speech; speak, say
不 bù no, not; un-; negative prefix
由 yóu cause, reason; from
衷 zhōng heart, from bottom of one's heart