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299 antonyms for viable
impracticable
impossible
unworkable
hopeless
unattainable
unfeasible
unrealizable
inconceivable
unachievable
unlikely
unpractical
unreasonable
unthinkable
incredible
unbelievable
improbable
unimaginable
fantastic
unconvincing
unobtainable
impractical
extraordinary
insolvable
preposterous
fantastical