Synonyms for On the up and up:

• adj.

  •decent (adjective)
  • conforming,
  • fit,
  • undefiled,
  • immaculate,
  • comely,
  • pure,
  • virtuous,
  • stainless,
  • befitting,
  • decorous,
  • unblemished,
  • honorable,
  • suitable,
  • polite,
  • moral,
  • nice,
  • fitting,
  • good,
  • right,
  • delicate,
  • Comme Il Faut,
  • becoming,
  • noble,
  • trustworthy,
  • upright,
  • worthy,
  • seemly,
  • prudent,
  • correct,
  • mannerly,
  • untarnished,
  • proper,
  • chaste,
  • straight,
  • continent,
  • standard,
  • presentable,
  • modest,
  • approved,
  • reserved,
  • clean,
  • spotless.
  •honest (adjective)
  • forthright,
  • genuine,
  • scrupulous,
  • outright,
  • bona fide*,
  • sincere,
  • direct,
  • above-board,
  • reliable,
  • high-minded,
  • real,
  • plain,
  • conscientious,
  • authentic,
  • fair and square,
  • trusty,
  • equitable,
  • frank,
  • fair,
  • just,
  • open,
  • straightforward,
  • veracious,
  • unfeigned.
  •lawful (adjective)
  • justifiable,
  • mandated,
  • constitutional,
  • ordered,
  • established,
  • Jurisprudent,
  • statutory,
  • Passed,
  • Judged,
  • due,
  • Legalized,
  • warranted,
  • decreed,
  • Legislated,
  • innocent,
  • valid,
  • canonical,
  • protected,
  • ruled,
  • bona fide,
  • official,
  • vested,
  • kosher*,
  • legitimatized,
  • Commanded,
  • Enjoined,
  • rightful,
  • authorized,
  • Enacted,
  • enforced.
  •legal (adjective)
  • contractual,
  • prescribed,
  • sound,
  • sure enough,
  • precedented,
  • acknowledged,
  • justified,
  • Enforcible,
  • within the law,
  • sanctioned,
  • granted,
  • Allowed,
  • forensic,
  • chartered,
  • clean*.
  •legitimate (adjective)
  • appropriate,
  • logical,
  • probable,
  • normal,
  • verifiable,
  • regular,
  • recognized,
  • accepted,
  • reasonable,
  • certain,
  • natural,
  • accredited,
  • consistent,
  • cogent,
  • customary,
  • sensible,
  • sure,
  • admissible,
  • typical,
  • usual,
  • orthodox.
  •on the level (adjective)
  • straight-shooting,
  • square.
  •permissible (adjective)
  • bearable,
  • permitted,
  • acceptable,
  • all right,
  • tolerable,
  • okay*,
  • endorsed.
  •proper (adjective)
  • kosher.
  •rightful (adjective)
  • applicable,
  • deserved,
  • right-minded,
  • moralistic,
  • twenty-four carat,
  • requisite,
  • apt,
  • merited,
  • principled,
  • holding water.
  •true (adjective)
  • veridical,
  • truehearted,
  • undistorted,
  • high-principled,
  • liege.
  •truthful (adjective)
  • truth-telling,
  • plainspoken.
  •veracious (adjective)
  • undeceptive,
  • on the line,
  • straight-arrow,
  • on line,
  • straightarrow.
  •virtuous (adjective)
  • clean-living,
  • without reproach,
  • in the clear.

• adv.

  •aboveboard (adverb)
  • honestly,
  • Veraciously,
  • openly,
  • truthfully,
  • Overtly,
  • truly,
  • on the up and up,
  • frankly.
  •objectively (adverb)
  • equitably,
  • dispassionately,
  • justly,
  • soberly,
  • open-mindedly,
  • considerately,
  • detachedly,
  • with objectivity,
  • indifferently,
  • squarely,
  • with an open mind,
  • Neutrally,
  • evenhandedly,
  • with impartiality,
  • without prejudice,
  • without favor,
  • disinterestedly.

• adv

  •aboveboard (adverb)
  • on up and up.

• Other synonyms:

  •
  • enhanced,
  • Furbished,
  • improved.
  •
  • compensatory,
  • second-generation,
  • dressed-up.
  •
  • remedial.
  •
  • corrective.
  •
  • new.
  •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.