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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Merriam-Webster unabridged
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Time Traveler for immature
The first known use of immature was in 1548
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