おさない
young, childish
Not much thread and not much power in it yet, which is a small child exactly. Oh おさ, sunny ない, and no idea about anything at all. She has one at home: おさない.
若い わかい is young as in not old and stretches into your thirties. 幼い is a small child, and said of an adult it means immature.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.