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 of little importance
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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 small
Adjective
Opposite of not up to an expected or required quality or standard
Adjective
Opposite of not convincing, plausible or believable
Adjective
Opposite of easily excused or forgiven
Adjective
Opposite of of a minimum amount, quantity, or degree
“I was thrilled that I got the maximum marks on my end of year exams.”
Adjective
Opposite of not careful or thorough
“Officer Ellingson conducted a thorough search of the vehicle, including for fingerprints, but did not find much that could be clearly linked to the car thief.”
Noun
Opposite of playing at courtship
Noun
Opposite of habitual indisposition to action or motion
Noun
Opposite of a lack of seriousness, especially at an improper time
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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