Synonyms of immature
1
a
: 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
immature talents
a vigorous but immature school of art
2
archaic : premature
immature noun
immaturely adverb
immaturity noun

immaturity

2 of 2

noun

1
: the state or quality of being immature
emotional and cultural immaturity
the immaturity of such coarse mineral soils
2
: something immature
childish immaturities
always within his immaturities is the saving grace of his willingness … to accept responsibilityTimes Literary Supplement

Synonyms of immature

Examples of immature in a Sentence

Adjective The flock included both adult and immature birds. His teachers have complained about his immature behavior.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Adjective
There’s nothing wrong with holding on to childhood and being a little immature from time to time. Loren Savini, Allure, 22 Aug. 2026 The acclaimed writer Rachel Cusk’s controversial new novel Life of M is an intimate, unvarnished character study of an A-list movie star who is depicted as hollow, immature and cynical, an intellectual poseur and an artist wannabe. Gary Baum, HollywoodReporter, 19 Aug. 2026 In the first stage, 3 to 6 months in a mouse [about 20 to 30 years in a human], there is a loss of certain fat and muscle cells, and of two immature cell types in the brain that have the capacity to regenerate different types of brain tissue. Ingrid Wickelgren, Quanta Magazine, 14 Aug. 2026 The science remains too immature to show whether such behavior is inevitable, Hobbhahn says. Chris Stokel-Walker, Scientific American, 7 Aug. 2026 See All Example Sentences for immature

Word History

Etymology

Adjective

Latin immaturus, from in- + maturus mature

Noun

Latin immaturitas, from immaturus + -itas -ity

First Known Use

Adjective

1548, in the meaning defined at sense 2

Noun

circa 1550, in the meaning defined above

Time Traveler
The first known use of immature was in 1548

Browse Nearby Words

Cite this Entry

“Immature.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/immature. Accessed 25 Aug. 2026.

Kids Definition

immature

adjective
1
: not mature or fully developed : young, unripe
an immature bird
immature fruit
2
: showing less than an expected degree of maturity
immature behavior
immaturely adverb

Medical Definition

immature

adjective
im·​ma·​ture
ˌim-ə-ˈt(y)u̇(ə)r also -ˈchu̇(ə)r
: lacking complete growth, differentiation, or development
immature blood cells
emotionally immature
immaturely adverb
immaturity
-ˈt(y)u̇r-ət-ē also -ˈchu̇r-
noun
plural immaturities
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