immature
1 ENTRIES FOUND:
Britannica Dictionary definition of IMMATURE
:
not mature: such as
a
:
not fully developed or grown
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The flock included both adult and immature birds.
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The fruit was still immature. [=unripe]
b
[more immature; most immature]
:
acting in a childish way
:
having or showing a lack of emotional maturity
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emotionally immature adults
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His teachers have complained about his immature behavior.
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His tantrums are a sign of immaturity.
