perfidiously

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/pɜːˈfɪdɪəslɪ/


WordReference Random House Learner's Dictionary of American English © 2025
per•fid•i•ous /pɚˈfɪdiəs/USA pronunciation  adj. 
    1. treacherous;
      untrustworthy;
      betraying others;
      faithless.
    See -fid-.
WordReference Random House Unabridged Dictionary of American English © 2025
per•fid•i•ous  (pər fid′ē əs),USA pronunciation adj. 
  1. deliberately faithless;
    treacherous;
    deceitful:a perfidious lover.
  • Latin perfidiōsus faithless, dishonest. See perfidy, -ous
  • 1590–1600
per•fid′i•ous•ly, adv. 
per•fid′i•ous•ness, n. 
    false, disloyal; unfaithful, traitorous.
    faithful.

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