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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.

Opposite of silly, especially in a childish way
Opposite of of little value or importance
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Opposite of fond of or characterized by joking
Opposite of treating serious issues with inappropriate humor
“I was being sincere when I accepted your challenge to a boxing match.”
Opposite of not very convincing
Opposite of done or spoken with ease and carefreeness
“Doubters and critics have poured scorn on our ambitious plans or urged speed when a more thoughtful approach was deserved and required.”
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.”
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.”
Opposite of lacking in meaning
“After five fulfilling years of working abroad, Henry was finally ready to go back home.”
(informal) Opposite of done for a non-work related purpose
“He went on a work-related trip to meet with some clients.”
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.”
Opposite of impulsive, reckless, or unlikely to succeed
Opposite of without a specific purpose, meaning or goal
“It keeps people busy with useful, purposeful work, and that's a good way to form a team.”
Opposite of cheerfully unconcerned about the future or things in general
“He was, in spite of all his genius and accomplishment, a troubled man seeking his own truth.”
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