詳 means “detailed, well-informed”

くわしい · kuwashii

Also: full, minute, accurate

Kun'yomi (Japanese reading)
くわしい, つまびらか
On'yomi (Chinese reading)
ショウ

JLPT N1 · Taught in secondary school · 13 strokes

The story

Words (言) beside a sheep (羊): picture describing every curl of the fleece. 詳しい is detailed, or knowing a subject well, 詳細 are the full details, and 年齢不詳, age unknown, is said of someone who never seems to grow older.

Used in 詳しい (kuwashii, detailed/knowledgeable), 詳細 (shousai, details), and 不詳 (fushou, unknown)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.