immature

/ˌɪmət‍ʃˈɔː/

/ˌɪmətˈjʊɹ/

immature

behaving like a much younger person or showing less intellectual development than expected

antonyms : mature

not yet mature

antonyms : mature

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

synonyms : young

antonyms : old

(of birds) not yet having developed feathers

synonyms : unfledged

antonyms : fledged

not fully developed or mature; not ripe

synonyms : green

antonyms : ripe

Examples

1. The seeds inside those pea seeds are immature.

2. The others are immature.

3. The behavior is immature.

4. Younger men are immature.