3 adjectives to describe maturing

Yet still one joy remains: that not obscure Nor useless, all my vacant days have flowed, From youth's gay dawn to manhood's prime mature; Nor with the Muse's laurel unbestowed.

Genuine love matures in a moment the youth into manhood; He is not easily moved; and I fear that if this be refused him, Sadly his years will go by, those years that should be the fairest.

The experiment was in many respects satisfactory, but we realized that a longer training and a more thorough maturing of character were needed in those who had just emerged from the darkness and limitations of slavery.

3 adjectives to describe  maturing