What is the opposite of light-hearted?

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

(of a person or their behaviour) Opposite of cheerful or carefree
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Opposite of lacking in seriousness or maturity
Opposite of amusingly unconventional and idiosyncratic
Opposite of showing a casual lack of concern
Opposite of making light of something usually regarded as serious or sacred
“I was being sincere when I accepted your challenge to a boxing match.”
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