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.

(01 Mar 1998)