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 silly in a childish way
Adjective
Opposite of of little value or importance
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Adjective
Opposite of treating serious issues with inappropriate humor
“I was being sincere when I accepted your challenge to a boxing match.”
Adjective
Opposite of frivolous or trivial in nature
“It seems that you would rather get up on your soapbox than have a meaningful conversation.”
Adjective
Opposite of ridiculously trivial or frivolous
“Risk management on an enterprise level is important in driving business strategies and performance.”
Adjective
Opposite of cheerfully unconcerned about the future or things in general
Adjective
Opposite of playful, lively, or flirtatious
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 silly or inappropriate in nature
“The children have been warmly praised for their sensible actions in passing the information on to school authorities.”
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 quick or likely to change consistently
“Most organic substances react with oxygen exothermically, but are quite stable, because the activation energy to do so is so large.”
Adjective
Opposite of without a specific purpose, meaning or goal
Adjective
Opposite of not very convincing
Adjective
Opposite of delicate or ethereal
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