unable : (adj.) abhabba; asamattha; asakkonta.

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

nus ma yin

[translation-san] {C} prabhavati

[translation-eng] {Hopkins} unable; powerless

[translation-eng] {C} be able to

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary