adj. dead; vanished; gone
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Extinct
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Incubment
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Morose
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Motely
A
Correct answer
Explanation
Extinct means no longer existing or living - vanished and gone, which matches the definition perfectly. Incubment appears to be a typo or garbled word. Morose means sad/sullen, and motely (likely misspelled 'motley') means mixed - neither means dead or gone.