TSUMUGU · TOCFL C1 (est.) · 詞
幼稚
ㄧㄡˋ ㄓˋ · yòuzhì
adj — childish, immature, naive (of a person's thinking); young, infant (literal)
關 · Related
兒yòu'éra small child — the same , the literal age成熟chéngshúripe, mature — the opposite quality