rén​xīn​bù​gǔ

public morality has declined

  1. conscience
    Moral character, kindness, or heart; often used in the context of having or lacking a conscience
  2. adverb
    not
    Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
  3. adjective
    simple
    unsophisticated and sincere; having an old-fashioned simplicity or charm