say it: BRAY-nee
brainy is an adjective meaning "having or marked by unusual and impressive intelligence". It carries one recorded sense.
having or marked by unusual and impressive intelligence
“our project needs brainy women”
“a brilliant mind”
“a brilliant solution to the problem”
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for brainy come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.