im·​ma·​ture ˌi-mə-ˈchu̇r How to pronounce immature (audio) -ˈtu̇r How to pronounce immature (audio)
: exhibiting less than an expected degree of maturity
emotionally immature adults
: lacking complete growth, differentiation, or development
immature fruits
a sexually immature bird
: having the potential capacity to attain a definitive form or state : crude, unfinished
a vigorous but immature school of art
archaic : premature
immature noun
immaturely adverb
ˌi-mə-ˈchu̇r-ə-tē How to pronounce immature (audio)

Examples of immature in a Sentence

The flock included both adult and immature birds. His teachers have complained about his immature behavior.
Recent Examples on the Web Some immature stingrays and reports of mating behavior suggest the species is established in the area enough to reproduce. Aspen Pflughoeft, Miami Herald, 21 May 2024 The distillery actually has some more experimental expressions that are worth trying as well, but the core bourbon (and rye) has always met the BIB requirements—at least four years old, exactly 100 proof, and produced at one distillery—so there’s never been a green, immature batch in the mix. Jonah Flicker, Robb Report, 15 May 2024 The immature bunch that TNT analyst Charles Barkley loved to clown on national television for being the opposite of smart. Dane Mizutani, Twin Cities, 12 May 2024 Hunting dog and breed experts who weighed in said Cricket's breed is often physically immature and not fully trained to hunt for up to five years; Cricket was just 14 months old. Monica Potts, ABC News, 8 May 2024 The Minnesota Department of Health reports that 1 in 3 adult black-legged ticks, commonly referred to as deer or bear ticks, carry Lyme disease, while 1 in 5 immature black-legged ticks carry it. Marina Johnson, The Courier-Journal, 8 May 2024 An immature cicada that happens to be a couple feet underground will experience cooler temperatures than one just a few inches below the surface. Carl Zimmer, New York Times, 24 Apr. 2024 Tennis is, after all, not just their connection to each other but their lives, their collective obsession, the thing fueling their fame, fortune and immature follies. David Fear, Rolling Stone, 26 Apr. 2024 Even Stevens was never afraid to go all out for its constant string of gags and jokes, led by Shia LaBeouf as the immature prankster Louis Stevens. Ew Staff,, 15 Apr. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'immature.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Latin immaturus, from in- + maturus mature

First Known Use

1548, in the meaning defined at sense 2

Time Traveler
The first known use of immature was in 1548

Dictionary Entries Near immature

Cite this Entry

“Immature.” Dictionary, Merriam-Webster, Accessed 28 May. 2024.

Kids Definition


im·​ma·​ture ˌim-ə-ˈt(y)u̇(ə)r How to pronounce immature (audio)
: not mature or fully developed : young, unripe
an immature bird
immature fruit
: showing less than an expected degree of maturity
immature behavior
immaturely adverb

Medical Definition


ˌim-ə-ˈt(y)u̇(ə)r also -ˈchu̇(ə)r
: lacking complete growth, differentiation, or development
immature blood cells
emotionally immature
immaturely adverb
-ˈt(y)u̇r-ət-ē also -ˈchu̇r-
plural immaturities

More from Merriam-Webster on immature

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