2 adjectives to describe mature

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.

2 adjectives to describe  mature