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
At the very worst, an immature 18-year-old makes a horrific decision on a whim to deface his or her torso with a tableau of repulsive images that could potentially cause medical complications later in life.
—
Scott Liftman, Boston Herald, 25 July 2025
The researchers showed how the interplay between a baby's rising sleep pressure and immature circadian rhythms can create seemingly erratic nap behavior that, in reality, follows a mathematically predictable pattern.
—Daniella Gray, MSNBC Newsweek, 23 July 2025
Most of these individuals were immature, and their movements were tightly clustered around the tagging locations, which suggests a strong site attachment, possibly influenced by food availability or safety from predators.
—Melissa Cristina Márquez, Forbes.com, 16 July 2025
All of the brains contained immature neurons except one.
—Nora Bradford, Scientific American, 3 July 2025
See All Example Sentences for immature
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Scott Liftman, Boston Herald, 25 July 2025
The researchers showed how the interplay between a baby's rising sleep pressure and immature circadian rhythms can create seemingly erratic nap behavior that, in reality, follows a mathematically predictable pattern.
—Daniella Gray, MSNBC Newsweek, 23 July 2025
Most of these individuals were immature, and their movements were tightly clustered around the tagging locations, which suggests a strong site attachment, possibly influenced by food availability or safety from predators.
—Melissa Cristina Márquez, Forbes.com, 16 July 2025
All of the brains contained immature neurons except one.
—Nora Bradford, Scientific American, 3 July 2025
See All Example Sentences for immature
Cite this Entry
“Immature.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/immature. Accessed 30 Jul. 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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