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
immature noun
immaturely adverb
immaturity
ˌi-mə-ˈchu̇r-ə-tē
noun -ˈtu̇r-
-ˈtyu̇r-
Synonyms
- adolescent
- juvenile
- young
- youngish
- youthful
See all Synonyms & Antonyms 
Example Sentences
The flock included both adult and immature birds. His teachers have complained about his immature behavior.
Recent Examples on the Web Adults 21 and older would be permitted to possess and purchase up to one ounce of marijuana and grow up to six mature and six immature cannabis plants at home. 
A.j. Herrington, Forbes, 26 Aug. 2022 But the girl was found to be too immature to decide the fate of her unborn child after failing to adequately articulate her request. Landon Mion, Fox News, 17 Aug. 2022 Numerous photos posted to Suters’ social media pages indicate there is a far greater number of marijuana plants than Vermont’s permitted two mature plants or four immature plants that private citizens can own. Cheyenne Roundtree, Rolling Stone, 23 June 2022 In a high-stakes evolutionary gambit, female mammals are born with a finite supply of immature eggs. Megan Molteni, STAT, 23 July 2022 The more immature the flower, the longer the plant should last. Jeff Lowenfels, Anchorage Daily News, 25 Nov. 2021 Amazon was trying to build a service capable of understanding language spoken from across a noisy room, using a relatively immature technology called far-field speech recognition. Brad Stone, Wired, 11 May 2021 Despite your insight, your behavior reflects an immature response to the stress in your life. Amy Dickinson, Detroit Free Press, 7 July 2022 Many immature companies were being rushed to the public market with little more than an idea and a sales pitch. Jon Markman, Forbes, 6 July 2022 See More
A.j. Herrington, Forbes, 26 Aug. 2022 But the girl was found to be too immature to decide the fate of her unborn child after failing to adequately articulate her request. Landon Mion, Fox News, 17 Aug. 2022 Numerous photos posted to Suters’ social media pages indicate there is a far greater number of marijuana plants than Vermont’s permitted two mature plants or four immature plants that private citizens can own. Cheyenne Roundtree, Rolling Stone, 23 June 2022 In a high-stakes evolutionary gambit, female mammals are born with a finite supply of immature eggs. Megan Molteni, STAT, 23 July 2022 The more immature the flower, the longer the plant should last. Jeff Lowenfels, Anchorage Daily News, 25 Nov. 2021 Amazon was trying to build a service capable of understanding language spoken from across a noisy room, using a relatively immature technology called far-field speech recognition. Brad Stone, Wired, 11 May 2021 Despite your insight, your behavior reflects an immature response to the stress in your life. Amy Dickinson, Detroit Free Press, 7 July 2022 Many immature companies were being rushed to the public market with little more than an idea and a sales pitch. Jon Markman, Forbes, 6 July 2022 See More Word History
Etymology
Latin immaturus, from in- + maturus mature
First Known Use
1548, in the meaning defined at sense 2
Kids Definition
immature
adjective
im·ma·ture ˌi-mə-ˈtu̇r
-ˈtyu̇r,
-ˈchu̇r
1
: not yet fully grown or ripe
an immature bird
immature fruit
2
: acting in or exhibiting a childish manner
an immature teenager
immature behavior
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
immature
adjective
1
as in young
being in the early stage of life, growth, or development immature frogs are called "tadpoles" Synonyms & Similar Words
Relevance
- young
- juvenile
- youthful
- adolescent
- inexperienced
- teenage
- youngish
- childish
- teenaged
- infantile
- puerile
- underage
- childlike
- embryonic
- callow
- preteen
- emergent
- babyish
- subadult
- flowering
- minor
- unripe
- undeveloped
- ephebic
- unfledged
- unformed
- kiddish
- unripened
- unfinished
- green
- infantine
- burgeoning
- blossoming
- blooming
- raw
- flourishing
Antonyms & Near Antonyms
- mature
- matured
- adult
- older
- old
- senescent
- elderly
- senior
- oldish
- aged
- ancient
- geriatric
- aging
- ageing
- grown-up
- ripe
- ripened
- mellow
- long-lived
- golden
- senile
- decrepit
- doddering
- full-blown
- full-fledged
- spavined
- middle-aged
- over-the-hill
- tottery
- anile
2
as in childish
having or showing the annoying qualities (as silliness) associated with children an immature teenager who still threw tantrums Synonyms & Similar Words
- childish
- juvenile
- adolescent
- infantile
- babyish
- puerile
- kiddish
- jejune
- naive
- innocent
- unsophisticated
- bratty
- girlish
- childlike
- boyish
- simple
- girlie
- naïve
- brattish
- simplistic
- girly
Antonyms & Near Antonyms
- mature
- adult
- sophisticated
- grown-up
- smart
- worldly
- experienced
- cosmopolitan
- knowing
- unchildlike
- worldly-wise
3
as in inexperienced
lacking in adult experience or maturity many high school students are still too immature to foresee the consequences of their actions Synonyms & Similar Words
- inexperienced
- adolescent
- young
- juvenile
- unripe
- puerile
- callow
- unfledged
- childish
- unformed
- unripened
- youthful
- naive
- green
- infantile
- babyish
- raw
- innocent
- girlish
- infantilized
- boyish
- unsophisticated
- youngish
- infantine
- wet behind the ears
- kiddish
- naïve
- virginal
- ingenuous
- untrained
- unseasoned
- maidenly
- untried
- unknowing
- tender
- juvenescent
Antonyms & Near Antonyms
- mature
- adult
- ripe
- experienced
- precocious
- advanced
- grown-up
- sophisticated
- worldly
- savvy
- knowing
- worldly-wise
- surgeon apothecary
- surgeon commander
- surgeon dentist
- surgeon general
- surgeon major
- surgeon's agaric
- surgeon's knot
- surgeoncies
- surgeoncy
- surgeonfish
- surgeonfishes
- surgeons
- surgeons general
- surgeons major
- surgeonships
- surgeries
- surgers
- surgery
- surges
- surgical
- surgical knot
- surgical mask
- surgical masks
- surgical spirit
- surgical strike