1. (

• immature ,

) characteristic of a lack of maturity; "immature behavior" ;

2. (

• young ,
• immature ,

) (used of living things especially persons) in an early period of life or development or growth; "young people" ;

3. (

• green ,
• unripe ,
• unripened ,
• immature ,

) not fully developed or mature; not ripe; "unripe fruit"; "fried green tomatoes"; "green wood" ;

4. (

• immature ,

) not yet mature ;

5. (

• unfledged ,
• immature ,

) (of birds) not yet having developed feathers; "a small unfledged sparrow on the window sill" ;