Extinct' is a term used to describe something that has died out or no longer exists. INANIMATE is an adjective used to describe something that is not alive, such as a rock or a machine. Passe is an adjective used to describe something that is no longer fashionable or relevant. ARCHAIC is an adjective used to describe something that is very old and outdated. BYGONE is an adjective used to describe something that is from the past and no longer exists. DECEASED is an adjective used to describe something that has died. ASLEEP is an adjective used to describe something that is in a state of rest or unconsciousness. FALLEN is an adjective used to describe something that has been defeated or destroyed. DEPARTED is an adjective used to describe something that has left or GONE away. COLD is an adjective used to describe something that is without warmth or emotion. LATE is an adjective used to describe something that has passed its due date or time. LOST is an adjective used to describe something that cannot be found or has GONE astray. DEAD is an adjective used to describe something that is no longer alive. GONE is an adjective used to describe something that has disappeared or vanished. Nomore is an adjective used to describe something that does not exist anymore. DEFUNCT is an adjective used to describe something that is no longer in existence or operation. All of these adjectives can be used to describe the term 'extinct, ' which means something that has died out or no longer exists.