Noah Webster's Dictionary 1. (a.) Not full-grown; unripe; unfinished; as, immature fruit; immature character; immature plans. 2. (a.) Premature; untimely; too early; as, an immature death.

Multi-Version Concordance Immature (1 Occurrence) Romans 2:20 a corrector of the foolish, a teacher of babies, having in the law the form of knowledge and of the truth. (See NAS)