irredeemable

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Adjective irredeemable has 2 senses

irreclaimable, irredeemable, unredeemable, unreformable - insusceptible of reform; "vicious irreclaimable boys"; "irredeemable sinners"
Antonym: virtuous (indirect, via wicked)
irredeemable - (of paper money) not convertible into coin at the pleasure of the holder
Antonyms: convertible, exchangeable (indirect, via inconvertible)