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- not well developed; not attained the mental, emotional or intellectual maturity; of, characteristic of or suitable for children or young persons.
- not arrogant; gentle; mild.
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- (Noun)
- an intellectually, emotionally not developed man; a man who lacks knowledge, esp. erudition.
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- (Noun)
- an intellectually, emotionally not developed woman; a woman who lacks knowledge, esp. erudition.