"pubescent" in the adjective sense
1. pubescent
of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature
"the budding breasts of a pubescent girl and the downy chin of pubescent boy"
2. downy, pubescent, puberulent, sericeous
covered with fine soft hairs or down
"downy milkweed seeds"
Source: WordNet® (An amazing lexical database of English)
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