Definition Of immature
not fully developed.
many of the fish caught are immature
Example Of immature
All the guys were immature or just plain weird.
Among immature males, those obtained from the wild also clustered together.
Because this is kind of what an immature Bald Eagle would look like if you're looking at one.
But, my evaluation of her was that she was rather immature and seeking attention.
Callie knew she was acting a little immature , but she didn't care.