(Of a place) visited only rarely:a region with only a few unfrequented tracks...
We perplexed everyone around us by walking up the unfrequented road the quarter mile or so to the museum.
To elude this vulnerability, employees should avoid browsing the Internet and visiting unfrequented websites not pertinent to business needs.
At 901 metres, it just falls short of Munro's height so it's relatively unfrequented, other than the visits of a local mountaineer who has apparently climbed the hill more than 1000 times.