Definition of adolescent:
displaying or suggesting a lack of maturity
Synonyms of adolescent:
jejune, juvenile, puerile, teenage, youth, youthful, minor, young, immature
Opposite/Antonyms of adolescent:
adult, elderly, matured, grown-up, old, gray, big, older, infant
Sentence/Example of adolescent:
The trouble was in his conditioning, started when he was an adolescent.