親しい
したしい · shitashii · JLPT N3 · i-adj
friend
🤝 親 = parent: close as family. Shita-shii: she taught she, old friends
The kanji 親 means parent (also read oya), and 親しい extends that family closeness to friends. The same character appears in 親友 (shin'yuu, close friend) and 親切 (shinsetsu, kind), so one kanji carries the whole idea of warmth and closeness.