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Definition of immature
1a : exhibiting less than an expected degree of maturity
emotionally immature adults
b : lacking complete growth, differentiation, or development
immature fruits a sexually immature bird
c : having the potential capacity to attain a definitive form or state : crude, unfinished a vigorous but immature school of art
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Time Traveler for immature
The first known use of immature was in 1548
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