beautiful
嬋 centers on feminine beauty, describing a woman who is graceful and lovely.
嬋 combines 女 (woman) with 單, which likely contributes the sound. The exact historical development of 單 in this character is uncertain.
A woman 女 beside 單, which resembles a simple, elegant shape, suggests a beautiful woman.
For セン, picture a beautiful woman named Sen: Sen -> セン, and her beauty matches the kanji's meaning.
—
graceful; slim and beautiful