What is the opposite of infantile?

Need antonyms for infantile? Here's a list of opposite words from our thesaurus that you can use instead.

Opposite of pertaining to youth, infants or children
Opposite of lacking sense, meaning, or purpose
Opposite of foolish or crazy
Opposite of having an unusually strange character or behavior
“You know, Ramirez, sometimes you seem as normal as muck, and other times you're the most princely person I've met.”
Opposite of annoyingly or embarrassingly immature in nature or behavior
“I was half-expecting him to pour his eyes out, but when he apologized, I commended our six-year-old on his mature response to discipline.”
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