say it: im-uh-TYUUR
immature is an adjective meaning "characteristic of a lack of maturity". It carries 5 recorded senses.
characteristic of a lack of maturity
“immature behavior”
(used of living things especially persons) in an early period of life or development or growth
“young people”
living thing
not yet mature
(of birds) not yet having developed feathers
“a small unfledged sparrow on the window sill”
Definitions, synonyms and semantic relations for immature come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.