perfidious - WordReference.com Dictionary of English

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- - perfect cadence
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  - perfection
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  - perfidious
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perfidious

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Concise Oxford English Dictionary © 2008 Oxford University Press:
perfidious /pəˈfɪdɪəs/

▶adjective literary deceitful and untrustworthy: a perfidious lover.

– derivatives
perfidiously adverb,
perfidiousness noun.

'perfidious' also found in these Oxford entries:

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