おとなしい
tame, quiet, obedient, calm
Behaving the way an adult does, which said of a grown woman means she does not make a fuss. The same 大人 as ever, and nothing しい added to her: おとなしい.
Not childish and not shy either. It is the word for somebody calm and undemanding, and it is meant as a compliment. 静か しずか is quiet as in no noise.
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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.