Definition of perfidious in English:

perfidious

Syllabification: per·fid·i·ous
Pronunciation: /pərˈfidēəs
 
/

adjective

literary

Derivatives

perfidiously

adverb

Origin

late 16th century: from Latin perfidiosus, from perfidia 'treachery'.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody