immature

Adjective
1. characteristic of a lack of maturity; "immature behavior"
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2. lacking in development; "immature plans"; "an unformed character"
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3. (used of living things especially persons) in an early period of life or development or growth; "young people"
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4. not fully developed or mature; not ripe; "unripe fruit"; "fried green tomatoes"; "green wood"
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5. not yet mature
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(similar)
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6. (of birds) not yet having developed feathers; "a small unfledged sparrow on the window sill"
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