unsolvable

incapable of being solved or accomplished an apparently unsolvable problem Synonyms hopeless, insoluble, insolvable, insuperable, unattainable, undoable, unrealizable, impossibleRelated Words 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; futile, useless; absurd, fantastic (also fantastical), outlandish, preposterous, ridiculousNear Antonyms applicable, functional, practicable, practical, reasonable, serviceable, usable (also useable), useful, working; likely, probable; acceptable, believable, conceivable, credible, plausibleAntonyms achievable, attainable, doable, feasible, possible, realizable, resolvable, soluble, workable