| extinct | (adjective) no longer in existence; lost or especially having died out leaving no living representatives | Synonyms: nonextant |
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| (adjective) (of e.g. volcanoes) permanently inactive | - |
| (adjective) being out or having grown cold | Synonyms: out |
| extinguishable | (adjective) capable of being extinguished or killed | - |
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| extinguished | (adjective) of a conditioned response; caused to die out because of the absence or withdrawal of reinforcement | - |
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| extirpable | (adjective) capable of being totally destroyed or wiped out | Synonyms: exterminable |
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