The opposite of premature is over-ripe.
late
overdue
High Level Wellness
"Premature" can function as an adjective.
The premature baby was slow to develop.
His death was premature.
'Premature' in Spanish is 'prematuro'.
Its a premature sperm or a sperm that is not yet matured.
The Premature Burial was created in 1844.
Now that basturd was premature
my little brother was a premature
Mature or ripe before the proper time; as, the premature fruits of a hotbed., Happening, arriving, existing, or performed before the proper or usual time; adopted too soon; too early; untimely; as, a premature fall of snow; a premature birth; a premature opinion; premature decay., Arriving or received without due authentication or evidence; as, a premature report.
The baby is said to be premature.