RhymeZone: immature definitions

Definitions of immature:

adjective: not yet mature
adjective: characteristic of a lack of maturity
Example: "Immature behavior"
adjective: lacking in development
Example: "Immature plans"
adjective: (used of living things especially persons) in an early period of life or development or growth
adjective: (of birds) not yet having developed feathers
adjective: not fully developed or mature; not ripe

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See immature used in context: 54 rhymes, several books and articles.