Usage Note
Costaud is an informal adjective meaning physically strong or solidly built. Its feminine form is costaude, though the masculine is often used colloquially regardless of gender. It can also describe a tough or demanding task: c'est costaud comme travail (that's a tough job). It is not used in formal writing.
Examples
"Il est vraiment costaud pour son âge."
Natural Translation
He is really sturdy for his age.

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