UNTRODDEN

pathless, roadless, trackless, untracked, untrod, untrodden

(adjective) lacking pathways; “trackless wilderness”; “roadless areas”

Source: WordNet® 3.1

Etymology

Adjective

untrodden (comparative more untrodden, superlative most untrodden)

That has never been trod upon; unexplored, unspoiled.

Of a person: undefeated.

Source: Wiktionary

UNTREAD

Un*tread", v. t. Etym: [1st pref. un- + tread.]

Definition: To tread back; to retrace. Shak.

Source: Webster’s Unabridged Dictionary 1913 Edition