1. most intelligent or clever (superlative form of brainy)
Usage: informal

Examples

• She was considered the brainiest student in her graduating class.
• The brainiest kids often formed study groups together.
• He might not be the brainiest person, but he works harder than anyone else.
• The quiz show attracted some of the brainiest contestants from around the country.
• Among all her siblings, Maria was definitely the brainiest.
• The brainiest students were invited to participate in the academic competition.