What is the opposite of trifling?

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

Adjective
Opposite of unimportant or trivial
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Adjective
Opposite of ridiculously trivial or frivolous
“Risk management on an enterprise level is important in driving business strategies and performance.”
Adjective
Opposite of very low in quantity
Adjective
Opposite of not convincing, plausible or believable
Adjective
Opposite of easily excused or forgiven
Adjective
(of entertainment) Opposite of not profound or serious
“We watched a serious documentary about the impacts of climate change on the environment.”
Adjective
Opposite of casually calm and relaxed
Adjective
Opposite of dizzy or feeling faint, usually as a result of a drop in blood pressure to the brain
Adjective
Opposite of on the surface
Adjective
Opposite of of a minimum amount, quantity, or degree
Noun
Opposite of the quality of being frivolous
Noun
Opposite of playing at courtship
Noun
Opposite of habitual indisposition to action or motion
Noun
Opposite of dawdling
Noun
Opposite of playful or good-humoured joking
Determiner
Opposite of emphasizing insignificance
“Excelling at the firm often meant you would be relegated to positions of great influence.”
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