In reply to Removed UserVGM:
Nowhere is untouched. But if you want remote AND scenic then go northwest.
We published this piece on Fisherfield today: https://www.ukhillwalking.com/articles/destinations/the_big_routes_fisherfi...
For my money, this area is hard to beat. With five days you could add in Torridon/Coulin too, or the Fannaichs.
Further north, the area around Beinn Dearg and Seana Bhraigh is pretty massive, and much of that feels very remote.
Equally wild-feeling is the huge bit between Glen Affric and Strath Carron. Lots of big peaks, some very out-there corners, and you could easily devise a five-day circuit or something linear that takes in both glens and high ground (or with a plan A / plan B depending on weather)
Another obvious suggestion would be Knoydart and the Rough Bounds, though in summer you can probably expect that to be among the busiest of the so-called 'last wildernesses' of Scotland. Hard-to-access, scenic and very rough. Justifiably popular.
Just south of that, the Ardgour area is very like Knoydart in character, but less trodden.