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What is the opposite of childish?

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

Adjective
Opposite of of or like a child, suggestive or characterized by youth
“Sabrina was respectful and had an adultlike demeanor that impressed Mom.”
Adjective
Opposite of naive or innocent as a child would be
“Even though she was young, Rachel looked like an experienced archaeologist with her oversized backpack, double water bottles, and climbing boots.”
Adjective
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.”
Adjective
Opposite of lacking sense, meaning, or purpose
Adjective
Opposite of naive or innocent as a child or baby would be
Adjective
Opposite of silly, especially in a childish way
Adjective
Opposite of silly and pointless
Adjective
Opposite of lacking intelligence or sense
Adjective
Opposite of ridiculous, often to the point of being funny
“I suppose it's a sign of the times that their spoofs are more sensible than their genuine stuff.”
Adjective
Opposite of healthy and ageing gracefully
Adjective
Opposite of unwise
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