Synonyms for On the up and up:

• adj.

  •decent (adjective)
  • virtuous.
  •honest (adjective)
  • veracious.
  •lawful (adjective)
  • rightful.

• Other synonyms:

  •Other relevant words:
  • aboveboard.

Antonyms for On the up and up:

• adj.

  • decent
    indecent, unrespectable, inappropriate, unsuited, unsuitable, poor.
  • honest
    dishonest, untrustworthy, false, misleading, treacherous, fraudulent, untruthful, deceptive.
  • lawful
    illegitimate, prohibited, illegal, unlawful, taboo, illicit.
  • legal
    wrong.
  • legitimate
    unwarranted, invalid.
  • permissible
    unpermissible.
  • rightful
    wrongful, incorrect.

• adv.

  • aboveboard
    devious, shady, underhanded, lying, deceitful.
  • objectively
    subjectively, emotionally.