Synonyms for Dumb thing to do:

• n.

  •blunder (noun)
  • fluff,
  • flub,
  • boner,
  • slip,
  • inaccuracy,
  • impropriety,
  • fault,
  • error,
  • lapse,
  • bungle,
  • indiscretion,
  • solecism,
  • blooper,
  • oversight.
  •fiasco (noun)
  • failure,
  • embarrassment,
  • miscarriage,
  • breakdown,
  • farce,
  • screwup,
  • disaster,
  • debacle,
  • mess,
  • stunt,
  • flop,
  • abortion,
  • washout,
  • route,
  • flap,
  • ruin.
  •folly (noun)
  • impracticality,
  • foolishness,
  • inanity,
  • madness,
  • idiocy,
  • imbecility,
  • preposterousness,
  • triviality,
  • lunacy,
  • rashness,
  • stupidity,
  • unsoundness,
  • imprudence,
  • vice,
  • irrationality,
  • absurdity,
  • craziness,
  • fatuity.

• Other synonyms:

  •n.
  • blunder,
  • boo-boo,
  • daftness,
  • faux pas,
  • fiasco,
  • folly,
  • gaffe,
  • goof,
  • howler,
  • inadvisability,
  • obliquity,
  • recklessness,
  • senselessness,
  • silliness,
  • Obliquities,
  • slip up,
  • errors,
  • dottiness,
  • booboos,
  • booboo,
  • idiocies,
  • howlers,
  • witlessness,
  • muff,
  • boo-boos,
  • botched situation,
  • dumb move,
  • dumb thing to do,
  • dumb trick,
  • flub-up,
  • slip-up,
  • slip-ups.

Antonyms for Dumb thing to do:

• n.

  • blunder
    fix, restitution, accuracy, correction.
  • fiasco
    blessing, miracle, wonder, advantage, success, benefit, boon.
  • folly
    knowledge, wisdom, seriousness, judgment, understanding.