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Merriam-Webster's Collegiate Dictionary per·fid·i·ous
\\(ˌ)pər-ˈfi-dē-əs\\ adjective DATE 1572 : of, relating to, or characterized by perfidy Synonyms: see faithless
• per·fid·i·ous·ly adverb
• per·fid·i·ous·ness noun Oxford Advanced Learner's Dictionary-牛津双解-OALD7 perfidiousper·fidi·ous / pE5fidiEs; NAmE pEr5f- / adjective ( literary)that cannot be trusted 不可信任的；背叛的；不忠的
SYN treacherous Webster's Third New International Dictionary, Unabridged per·fid·i·ous
\pə(r)ˈfidēəs\ adjectiveEtymology: Latin perfidiosus, from perfidia perfidy + -osus -ous — more at perfidy : of, relating to, or characterized by perfidy : deceitful , treacherous
< that common but most perfidious refuge of men of letters … the profession of teaching — Matthew Arnold >
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