EXTINCT

adj. 1 defunct, dead, died out, gone, departed, vanished These are the bones of an extinct species of flying mammal 2 dated, outmoded, old-fashioned, antiquated, obsolete, archaic, out of date, antediluvian, ancient, old hat, passé, démodé High-button shoes and bustles have been extinct for almost a century 3 out, extinguished, quenched, burnt- or put or snuffed out; inactive, dormant The lake is in the caldera of an extinct volcano