First attested 1482, from Middle French adolescent, from Latin adolescentem, accusative form of adolescens, present participle of adolescere (“to become adult, grow up”), from ad- (“to”) + alescere (“to grow or become nourished”). The adjective first appeared in 1785.
adolescent (not comparable)
- Characteristic of, or relating to, or undergoing adolescence; immature.
- Schools, unless discipline were doubly strong, / Detain their adolescent charge too long.
Related terms 
adolescent (plural adolescents)
- adolescent in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- adolescent in The Century Dictionary, The Century Co., New York, 1911
Derived terms 
- third-person plural future active indicative of adolescō