Synonyms for On the up and up:

• adj.

  •decent (adjective)
  • virtuous,
  • honest.
  •honest (adjective)
  • decent,
  • true,
  • on the level,
  • veracious.
  •lawful (adjective)
  • legal,
  • permissible,
  • legit,
  • rightful.
  •legal (adjective)
  • legitimate,
  • lawful.
  •on the level (adjective)
  • aboveboard.
  •rightful (adjective)
  • rightful.
  •veracious (adjective)
  • veracious.
  •virtuous (adjective)
  • virtuous.

• Other synonyms:

  •Other relevant words:
  • honest,
  • legit,
  • lawful,
  • permissible,
  • truthful,
  • rightful,
  • legal,
  • decent,
  • on the level,
  • virtuous,
  • aboveboard,
  • legitimate,
  • veracious,
  • true.

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.