Unmatured vs. Immature — Which is Correct Spelling?

Not fully grown or developed

Marked by or suggesting a lack of normal maturity

An immature animal; a juvenile.

Occurring before the proper time; untimely, premature (especially of death).

Not fully formed or developed; not grown.

Childish in behavior; juvenile.

An immature member of a species.

Not mature; unripe; not arrived at perfection of full development; crude; unfinished; as, immature fruit; immature character; immature plans.

Premature; untimely; too early; as, an immature death.

Characteristic of a lack of maturity;

Lacking in development;

(used of living things especially persons) in an early period of life or development or growth;

Not fully developed or mature; not ripe;

Not yet mature

(of birds) not yet having developed feathers;