Definition of "untrodden"

Proofs of the presence of the white man are found all over the Territory in the shape of old bouilli tins, &c., and often when out after a strayed horse, I have imagined myself to be in wilds untrodden except by the foot of the blackfellow, but the sight of an unassuming empty sardine tin would remind me that the ubiquitous digger had been there first.

1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 342

If he could only get away from the holes in the banks, he thought, there would be no more faces. He swung off the path and plunged into the untrodden places of the wood.

1908 October, Kenneth Grahame, The Wind in the Willows, New York, N.Y.: Charles Scribner’s Sons

Moreover the most becoming place for temples and altars he said to be that which, while being most visible, would be most untrodden; for it is pleasant for those who are undefiled to approach it.

1994, Xenophon, translated by Amy L. Bonnette, Memorabilia, page 93

The upper layer of the soil is, therefore, less solid than in other trampled habitats and the optimum development of the community can only take place in the broader joints between paving stones in more untrodden places, often in strips of pavement at the foots[sic] of walls where the shifting sand accumulates and turbulent air currents may play an important role.

1969, S. Segal, Ecological Notes on Wall Vegetation, published 2013, page 252