Synonyms for What you see is what you get:

• adj.

  •conclusive (adjective)
  • compelling,
  • Clinching,
  • determinative,
  • revealing,
  • settling,
  • incontrovertible,
  • telling,
  • clear,
  • decisive,
  • irrevocable,
  • unambiguous,
  • unquestionable,
  • precise,
  • convincing,
  • unconditional,
  • demonstrative,
  • irrefutable,
  • resolving,
  • indisputable,
  • cogent,
  • flat out,
  • all out,
  • undeniable,
  • ultimate,
  • absolute,
  • unmistakable,
  • deciding.
  •honest (adjective)
  • open,
  • proper,
  • decent,
  • equitable,
  • just,
  • above-board,
  • outright,
  • authentic,
  • real,
  • scrupulous,
  • reliable,
  • plain,
  • true,
  • straightforward,
  • sincere,
  • straight,
  • frank,
  • upright,
  • forthright,
  • virtuous,
  • fair and square,
  • trusty,
  • conscientious,
  • honorable,
  • on the level,
  • fair,
  • bona fide,
  • trustworthy,
  • unfeigned,
  • genuine,
  • high-minded,
  • direct.

• Other synonyms:

  •adj.
  • ethical,
  • impartial,
  • ingenuous,
  • litmus test,
  • reputable,
  • veracious,
  • on the up and up,
  • most telling,
  • like it is,
  • true blue,
  • conclusive,
  • determinant,
  • honest,
  • law-abiding,
  • lay on the line,
  • unanswerable,
  • unarguable,
  • undisguised,
  • upfront,
  • Irrefragable,
  • Irrefrangible,
  • lay it on the line,
  • no lie,
  • on up and up,
  • straight out,
  • up-front.

Antonyms for What you see is what you get:

• adj.

  • conclusive
    dubious, doubtful, questionable, indefinite, disputable, inconclusive, uncertain, unsure, ambiguous, refutable.
  • honest
    deceitful, false, devious, lying, unfair, unreal, irresponsible, unsuitable, partial, insincere, corrupt, prejudiced, counterfeit, untrustworthy, unreasonable, deceptive, dishonest, untruthful, treacherous, fraudulent, unjust, biased, unreliable, misleading.