IMMATURE

unfledged, immature

(adjective) (of birds) not yet having developed feathers; “a small unfledged sparrow on the window sill”

immature

(adjective) not yet mature

immature

(adjective) characteristic of a lack of maturity; “immature behavior”

green, unripe, unripened, immature

(adjective) not fully developed or mature; not ripe; “unripe fruit”; “fried green tomatoes”; “green wood”

young, immature

(adjective) (used of living things especially persons) in an early period of life or development or growth; “young people”

Source: WordNet® 3.1

---

Etymology

Adjective

immature (comparative more immature, superlative most immature)

(now, rare) Occurring before the proper time; untimely, premature (especially of death). [from 16th c.]

Not fully formed or developed; not grown. [from 17th c.]

Childish in behavior; juvenile. [from 20th c.]

Synonyms

• (childish in behavior): infantile, milky; see also childish

Noun

immature (plural immatures)

An immature member of a species.

Source: Wiktionary

---

Im`ma*ture", a. Etym: [L. immaturus; pref. im- not + maturus mature, ripe. See Mature.]

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." Bacon.

2. Premature; untimely; too early; as, an immature death. [R.] Jer. Taylor.

Source: Webster’s Unabridged Dictionary 1913 Edition

---