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Brainy - definition of brainy by The Free Dictionary brainy adjective (Informal) intelligent, quick, bright, sharp, brilliant, acute, smart, alert, clever, rational, knowing, quick-witted I don't class myself as being very intelligent or brainy
Brainy Meaning, Definition, Synonym Antonym (2025) | BUHAVE Brainy means highly intelligent, smart, and quick-witted It refers to someone who thinks deeply, understands complex ideas easily, and applies knowledge effectively in different contexts It highlights mental alertness, cleverness, and strong reasoning power