trackless : (adj.) apada; sañcārahīna.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

gnas ma mchis pa

[translation-san] {C} apada

[translation-san] {C} asthāna

[translation-eng] {Hopkins} non-abiding; not remain

[translation-eng] {C} trackless; without a trace; groundless; taking his stand nowhere; not taking one's stand; no standing place; a non-standing; what cannot be

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary