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perfidious

per·fid·i·ous

perfidious

pronunciation:
pr fI di s
features:
Word Parts
part of speech: adjective
definition: purposely disloyal or treacherous; faithless.
You cannot trust such a perfidious rogue, a man who would betray even his best friend!
antonyms:
faithful
similar words:
disloyal
derivations: perfidiously (adv.), perfidiousness (n.)
Word Parts
The word perfidious contains the following part:
fid Latin root that means faith, trust