IMMATU'RE, adjective [Latin immaturus; in and maturus.] 1. Not mature or ripe; unripe; that has not arrived to a perfect state; applied to fruit. 2. Not perfect; not brought to a complete state; as immature plans or counsels. 3. Hasty; too early; that comes before the natural time. [In this sense, premature is generally used.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI