Wiktionary
a. Not mellowed.
Usage examples of "unmellowed".
High and slender torches, made paler by the unmellowed dawn, cast their light over various countenances, hushed for the moment in one solemn and intent expression.
But tell me, Isora, do you not love these rare scents that make an Araby of this unmellowed clime?
And, unless I wholly deceive myself, I see, not all the class--that will never be till the millennium--but here and there twos and threes, and more men than that, who will throw their whole hearts into the work of such a class till they come out of the hall in experimental religion like Sir Proteus in the play: Their years but young, but their experience old, Their heads unmellowed, but their judgment ripe.
These defects are interesting, because they represent the nature of Milton as it was then, noble and disinterested to the height of imagination, but self-assertive, unmellowed, angular.