Adolescence /ˌæd

fond /fɒnd/ /fɑːnd/ adjective LIKING
1. [ before noun ] having a great liking for someone or something
She was very fond of horses.
"I'm very fond of you, you know," he said.
My brother is fond of pointing out my mistakes.
Many of us have fond memories of our childhoods.
We said a fond farewell to each other (= We said goodbye in a loving way) and promised to write.
full-grown /ˌfʊlˈgrəʊn/ /-ˈgroʊn/ adjective ( mainly UK fully-grown )
describes people and other living things that have finished their physical growth and will not grow taller
A full-grown giraffe is 5.5m tall.
immature /ˌɪm.əˈtʃʊə r / /-ˈtʊr/ adjective
1. disapproving not behaving in a way which is as calm and wise as people expect from someone of your age
Stop being so silly and immature, Ben!
She's rather immature for her age, don't you think?
2. disapproving not experienced in a particular matter
politically immature
3. specialized not yet completely grown or developed
While the animals are still immature, they do not breed.