immature

immature is an   Adverb

Definition:

[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.

Synonyms: