Hebrew and Greek Strong's Dictionary with all the definitions plus combined with every place that word is used in the definitions.
Complete index of every word used in both the Hebrew and Greek Strong's Dictionary in English Word order.
Hebrew and Greek Expanded Dictionary
faithless 03586 ## kechash {kekh-awsh'} ; from 03584 ; {faithless} : -- lying .
faithless 0571 - apistos {ap'-is-tos}; from 0001 (as a negative particle) and 4103; (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).
faithless 1169 - deilos {di-los'}; from deos (dread); timid, i.e. (by implication) {faithless}: -- fearful.
faithlessness 0570 - apaistia {ap-is-tee'-ah}; from 0571; {faithlessness}, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience): -- unbelief.