Synonyms and Antonyms of undoable
- a combat mission of that type is not only undoable, it's foolish
impracticable, impractical, infeasible, unusable, unworkable
debatable, disputable, doubtable, doubtful, dubious, far-fetched, fishy, improbable, problematic (also problematical), questionable, shady, shaky, suspect, suspicious, unfeasible, unlikely
implausible, inconceivable, incredible, unbelievable, unimaginable, unthinkable
absurd, fantastic (also fantastical), outlandish, preposterous, ridiculous