Dear Stephen, dear colleagues,

Assuming that the Sanskrit equivalent of *nyan du mi/ma btub pa* is not recorded in Negi’s Tibetan-Sanskrit Dictionary, which I do not have at hand at the moment and which you may have already consulted, I am tempted to suggest *aśravaṇīya* or *aśrāvya,* that is, not in the sense of *inaudible* but rather in the sense of *unfit to be heard* (MW, s.v. aśrāvya). Compare also MW (s.v. śravaṇīya), which has also the meaning of *worth hearing.* The adjective in Tibetan seems to mean precisely *unworthy of hearing or listening to.*

Best wishes,

Dorji