| future | (adjective) yet to be or coming | - |
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| (adjective) a verb tense or other formation referring to events or states that have not yet happened | - |
| (adjective) (of elected officers) elected but not yet serving | Synonyms: next, succeeding |
| (adjective) effective in or looking toward the future | - |
| immature | (adjective) not yet mature | - |
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| (adjective) characteristic of a lack of maturity | - |
| (adjective) (used of living things especially persons) in an early period of life or development or growth | Synonyms: young |
| (adjective) (of birds) not yet having developed feathers | Synonyms: unfledged |
| (adjective) not fully developed or mature; not ripe | Synonyms: green, unripe, unripened |
| mature | (adjective) having reached full natural growth or development | - |
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| (adjective) characteristic of maturity | - |
| (adjective) (of birds) having developed feathers or plumage; often used in combination | Synonyms: fledged |
| (adjective) fully developed or matured and ready to be eaten or used | Synonyms: ripe |
| (adjective) fully considered and perfected | Synonyms: matured |
| miniature | (adjective) being on a very small scale | - |
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| premature | (adjective) born after a gestation period of less than the normal time | - |
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| (adjective) uncommonly early or before the expected time | Synonyms: untimely |
| (adjective) too soon or too hasty | Synonyms: previous |