unˈyouthfully, adv.
(un-1 11.)
| 1891 H. Lynch G. Meredith 80 Dahlia's lover is legal, sharp, and unyouthfully serious. |
unˈyouthfully, adv.
(un-1 11.)
| 1891 H. Lynch G. Meredith 80 Dahlia's lover is legal, sharp, and unyouthfully serious. |
Oxford English Dictionary