adversary:1

noun
ad*ver*sary \ ˈad-vər-ˌser-ē \ ˈad-və- \ -ˌse-rē \
14th century
  • one that contends with, opposes, or resists : an enemy or opponent

adversary:2

adjective
adversary \
14th century{ds||1||}
  • of, relating to, or involving an enemy or adversary
  • having or involving antagonistic parties or opposing interests
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