Antonyms of adj nascent

1 sense of nascent

Sense 1
nascent (vs. dying) -- (being born or beginning; "the nascent chicks"; "a nascent insurgency")

dying (vs. nascent) -- (in or associated with the process of passing from life or ceasing to be; "a dying man"; "his dying wish"; "a dying fire"; "a dying civilization")
        => moribund -- (being on the point of death; breathing your last; "a moribund patient")
        => last -- (occurring at the time of death; "his last words"; "the last rites")

Similarity of adj nascent

1 sense of nascent

Sense 1
nascent (vs. dying) -- (being born or beginning; "the nascent chicks"; "a nascent insurgency")
       => emergent, emerging -- (coming into existence; "an emergent republic")
       => dissilient -- (bursting open with force, as do some ripe seed vessels)
       => parturient -- (giving birth; "a parturient heifer")