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