What is the opposite of frivolous?

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

Adjective
Opposite of lacking in seriousness or maturity
Adjective
Opposite of lacking importance
Adjective
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.”
Adjective
Opposite of speaking with ease and rapidity
Adjective
Opposite of silly and lacking sense or discretion
Adjective
Opposite of a foolish person
Adjective
Opposite of ridiculously trivial or frivolous
“Risk management on an enterprise level is important in driving business strategies and performance.”
Adjective
Opposite of without purpose or direction
Adjective
Opposite of light-hearted and carefree
Adjective
Opposite of playful, lively, or flirtatious
Adjective
Opposite of for, or relating to, recreation
Adjective
Opposite of showing a casual lack of concern
Adjective
Opposite of lacking in meaning
“After five fulfilling years of working abroad, Henry was finally ready to go back home.”
Adjective
Opposite of showing disregard, indicating rejection, serving to dismiss
Adjective
Opposite of on the surface
Adjective
Opposite of lacking in seriousness or maturity
“If you were sensible, you would stop acting so childish!”
Adjective
Opposite of not very convincing
Adjective
Opposite of delicate or ethereal
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