Hypertext Webster Gateway: "perfidiously"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Perfidiously \Per*fid"i*ous*ly\, adv.
In a perfidious manner.
From WordNet (r) 1.7 (wn)
perfidiously
adv : in a perfidious manner; "he was playing perfidiously one
side against the other"
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