Unmellowed

Yet hath Sir Proteus, for that’s his name, Made use and fair advantage of his days; His years but young, but his experience old; His head unmellow’d, but his judgment ripe;

Source: wiktionary

I was afraid she would think it queer of me to give her such a present. And yet somehow it seemed to me that it was better than something brand new and unmellowed—that old book which father had loved and which I loved.

Source: wiktionary

The room gives off an air of clean spareness. The roof rafters are exposed, and the wood colors are raw and unmellowed.

Source: wiktionary

‘What do you think he meant, moron?’ asked Dover, apparently quite unmellowed by Mrs Boyle’s medicinal whisky.

Source: wiktionary