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Definition of Immature
1. Adjective. Characteristic of a lack of maturity. "Immature behavior"
Derivative terms: Immatureness, Immaturity
Antonyms: Mature
2. Adjective. (used of living things especially persons) in an early period of life or development or growth. "Young people"
Category relationships: Animate Thing, Living Thing
Attributes: Age
Also: New, Junior
Similar to: One-year-old, Two-year-old, Three-year-old, Four-year-old, Five-year-old, Adolescent, Teen, Teenage, Teenaged, Infantile, Boyish, Boylike, Schoolboyish, Childlike, Childly, Early, Girlish, Schoolgirlish, Junior, Little, Small, Newborn, Preadolescent, Preteen, Puppyish, Puppylike, Tender, Youngish, Vernal, Young, Youthful
Derivative terms: Immatureness, Young, Youngness
Antonyms: Old
3. Adjective. Not fully developed or mature; not ripe. "Green wood"
Similar to: Unaged
Derivative terms: Greenness, Immatureness, Immaturity
Antonyms: Ripe
4. Adjective. Not yet mature.
Similar to: Adolescent, Embryologic, Embryonal, Embryonic, Inchoative, Larval, Prepubertal, Prepubescent, Prepupal, Pubescent, Pupal, Underdeveloped
Also: Premature, Young
Derivative terms: Immatureness, Immaturity
Antonyms: Mature
5. Adjective. (of birds) not yet having developed feathers. "A small unfledged sparrow on the window sill"
Definition of Immature
1. a. Not mature; unripe; not arrived at perfection of full development; crude; unfinished; as, immature fruit; immature character; immature plans.
Definition of Immature
1. Adjective. Not fully formed or developed, unripe. ¹
2. Adjective. Childish in behavior. ¹
¹ Source: wiktionary.com
Definition of Immature
1. an individual that is not fully grown or developed [n -S]
Medical Definition of Immature
1. 1. Not mature; unripe; not arrived at perfection of full development; crude; unfinished; as, immature fruit; immature character; immature plans. "An ill-measured and immature counsel." 2. Premature; untimely; too early; as, an immature death. Origin: L. Immaturus; pref. Im- not + maturus mature, ripe. See Mature. Source: Websters Dictionary (01 Mar 1998)