immature
adjective
im·ma·ture
ˌi-mə-ˈchu̇r 
-ˈtu̇r
-ˈtu̇r
-ˈtyu̇r
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
a vigorous but immature school of art
2
archaic
: premature
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
Because of their immature immune systems, infants younger than 1 year old are at highest risk of contracting whooping cough -- also known as pertussis -- and are at most significant risk of severe illness.
—
Sabrina Malhi The Washington Post, arkansasonline.com, 26 Dec. 2024
Ironically, the rapid progress is a sign the product is still quite immature—a mature product won’t see much visible improvement in its last few years before deployment.
—Brad Templeton, Forbes, 20 Dec. 2024
And Ruby herself is written as an immature narcissist who would be unbearable to watch if she wasn’t played by as fundamentally charming an actor as Everything Everywhere All at Once alum Hsu.
—Alan Sepinwall, Rolling Stone, 19 Dec. 2024
Teen boxes are a bit more sophisticated and may include more makeup and skincare, while tween boxes will be a bit more immature.
—Jessica Booth, Parents, 16 Dec. 2024
See all Example Sentences for immature 
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Sabrina Malhi The Washington Post, arkansasonline.com, 26 Dec. 2024
Ironically, the rapid progress is a sign the product is still quite immature—a mature product won’t see much visible improvement in its last few years before deployment.
—Brad Templeton, Forbes, 20 Dec. 2024
And Ruby herself is written as an immature narcissist who would be unbearable to watch if she wasn’t played by as fundamentally charming an actor as Everything Everywhere All at Once alum Hsu.
—Alan Sepinwall, Rolling Stone, 19 Dec. 2024
Teen boxes are a bit more sophisticated and may include more makeup and skincare, while tween boxes will be a bit more immature.
—Jessica Booth, Parents, 16 Dec. 2024
See all Example Sentences for immature
Dictionary Entries Near immature
Cite this Entry
“Immature.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/immature. Accessed 5 Jan. 2025.
Copy CitationKids Definition
immature
adjective
im·ma·ture
ˌim-ə-ˈt(y)u̇(ə)r
2
: showing less than an expected degree of maturity
immature behavior
immaturely
adverb
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