What does 賢い mean?
賢い is a Japanese adjective meaning “wise, clever, smart” in English. It can also be translated as “well-behaved (esp. children and pets)” depending on context. It is written as 賢い in kanji, かしこい in hiragana, and kashikoi in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
あなたは何と賢い生徒なのでしょう。
What a clever student you are!