From a (as a negative particle) and a derivative of sbennumi; not extinguished, i.e. (by implication) perpetual -- not to be quenched, unquenchable.

see GREEK a

see GREEK sbennumi

ἄσβεστον (asbeston) − 1 Occurrence

ἀσβέστῳ (asbestō) − 2 Occurrences