Synonyms for undoing

noun

1. Ruin

   ruination, downfall, doom, reversal, destruction, misfortune, calamity, overthrow, collapse, trouble, grief, catastrophe, defeat, perdition, shipwreck, smash, wrack, subversion, discomfiture, collapse.

   Antonyms success*, accomplishment, achievement.

2. The cause of ruin

   casualty, accident, mishap, misadventure, misstep, faux pas (French), bad hap, catastrophe, mischance, bad luck, adversity, reverse, blow, trial, affliction, visitation, stroke of fate, slip, blunder, fault, omission, difficulty, failure, error, miscalculation, trip, stumble, fumble, blunder, repulse, discouragement, death-blow, last straw, death knell.

   Antonyms advantage*, good omen, godsend.