571. apistos (ap'-is-tos)
from a (as a negative particle) and pistos; (actively) disbelieving, i.e. without Christian faith (specially, a heathen); (passively) untrustworthy (person), or incredible (thing)
that believeth not, faithless, incredible thing, infidel, unbeliever(-ing).
see GREEK a
see GREEK pistos
