immature

[ im-uh-choor, -toor, -tyoor, -chur ]

adjective

1. not mature, ripe, developed, perfected, etc.
2. emotionally undeveloped; juvenile; childish.

   Synonyms: babyish, puerile, callow

3. Physical Geography. youthful ( def 5 ).
4. Archaic. premature.

immature

/ -ˈtʃʊə; ˌɪməˈtjʊə /

adjective

1. not fully grown or developed
2. deficient in maturity; lacking wisdom, insight, emotional stability, etc
3. geography a less common term for youthful

Derived Forms

• ˌimmaˈturity, noun
• ˌimmaˈturely, adverb

Other Words From

• imma·turely adverb
• imma·tureness noun

Word History and Origins

Origin of immature¹

First recorded in 1540–50, immature is from the Latin word immātūrus unripe, hence, untimely. See im- ², mature

Example Sentences

“You know what’s f— immature?”

From Los Angeles Times

“Everything you did was immature.”

From Los Angeles Times

When her friend asks her to underage drink under a bridge, she begrudges teenagers to Paul because "they all act so immature."

From Salon

Very, very immature in many other ways.

From BBC

Councilmember Monica Rodriguez labeled Jurado’s use of the phrase immature, while Councilmember Bob Blumenfield called it “incredibly offensive.”

From Los Angeles Times

Related Words

• childish
• premature