no longer in existence; that has ended or died out

an extinct species of fish.

no longer in use; obsolete

an extinct custom.

extinguished; quenched; not burning.

having ceased eruption; no longer active

an extinct volcano.

adjective

alive , existing , extant , living

adjective

abolished , archaic , asleep , bygone , cold * , dead and gone , deceased , defunct , departed , disappeared , done for * , doused , ended , exanimate , exterminated , extinguished , fallen , gone , inactive , late , lifeless , lost , no longer known , out , outmoded , pass , passed on , snuffed out , superseded , terminated , unknown , vanished , vanquished , void , dead , antiquated , obsolete