| Adj. | 1. | immature - characteristic of a lack of maturity; "immature behavior"mature - characteristic of maturity; "mature for her age" | |
| 2. | immature - lacking in development; "immature plans"; "an unformed character"undeveloped - not developed; "courses in interior design were rare and undeveloped"; "undeveloped social awareness" | |
| 3. | immature - (used of living things especially persons) in an early period of life or development or growth; "young people"new - not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered; "a new law"; "new cars"; "a new comet"; "a new friend"; "a new year"; "the New World" junior - younger; lower in rank; shorter in length of tenure or service | |
| 4. | immature - not fully developed or mature; not ripe; "unripe fruit"; "fried green tomatoes"; "green wood" | |
| 5. | immature - not yet maturepremature - born after a gestation period of less than the normal time; "a premature infant" young, immature - (used of living things especially persons) in an early period of life or development or growth; "young people" mature - having reached full natural growth or development; "a mature cell" | |
| 6. | immature - (of birds) not yet having developed feathers; "a small unfledged sparrow on the window sill" | |