spoorless

The black must have found, somewhere in Germany, his own version of Dzaqyp Qulan, some childish native to stare him out of German dreams of the Tenth-Elegy angel coming, wingbeats already at the edges of waking, coming to trample spoorless the white marketplace of his own exile ....

Gravity's Rainbow Pynchon, Thomas 1978

On the surface of the ground or through the swaying branches of the trees the spoor of man or beast was an open book to the ape-man, but even his acute senses were baffled by the spoorless trail of the airship.

Tarzan the Untamed 1920