Found 2 items, similar to immatureness.
English → English (WordNet) Definition: immatureness immatureness n : not having reached maturity [syn: immaturity] [ant: maturity]
English → English (gcide) Definition: Immatureness Immatureness \Im`ma*ture"ness\, n. The state or quality of being immature; immaturity. --Boyle. [1913 Webster]