Definition of Immature

not fully developed to adulthood

Examples of Immature in a sentence

A human is immature for many years, having to go through nearly two decades of development before becoming an adult.  🔊

While I was out fishing, I managed to catch an immature catfish, but I released it back into the water since it was just a baby.  🔊

An insect is only immature for a very short time, as baby insects often become full grown adults in just a few weeks or less.  🔊

Even though I am a teenager, I am still physical immature because my body is not done growing just yet.  🔊

On a strict technicality, you are physically immature until the day your body finally stops growing, marking you as a fully grown adult.  🔊

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