ラテン語fidēs信仰・信頼faith, trustこの語源をもつ英単語faith信頼・信仰faithful忠実なfaithfully忠実にfaithfulness忠実faithless信義に欠けるfaithlessness不信fayinterfaith宗教間のperfidious裏切りのperfidy裏切りunfaithful不実なunfaithfully不忠実にunfaithfulness不貞
