brilliancy
1 antonym for brilliancy — opposites grouped by meaning.
Noun — Great brightness or sparkle.
Synonyms by Meaning
2. noun
Something someone does that shows great skill or cleverness.
“His brilliancy lay in combining old concepts from far-flung fields into a new idea.”
Opposites
Antonyms
Etymology
Formed from brilliant and -ancy, and attested earlier than brilliance. Compare French brillance.
Full origin of brilliancy →