Other ways of saying intelligent
able to understand and learn things quickly: used especially in American English: Janey's a smart kid – she'll do okay.
intelligent and quick to understand things: He tries hard, but I don't think he's very bright.
brainy (informal old-fashioned)
intelligent and good at learning and studying: Ask Elizabeth, she's the brainy one around here.
extremely intelligent: a brilliant young doctor
able to understand and react to things quickly: She's very quick, and she should do well in a legal career.
quick to notice and understand things: He's a sharp trader who never misses a chance to make a profit.
able to use your knowledge and experience to judge what is right or true: I think they were wise to choose him.