opposing
1. [ adjective ] characterized by active hostility
Synonyms: opponent
Examples:

"opponent (or opposing) armies"

Related terms: hostile
2. [ adjective ] acting in opposition to
Examples:

"the opposing sector of the same muscle group"

Related terms: counteractive
3. [ adjective ] in opposition to (a policy or attitude etc.)
Synonyms: opposed
Examples:

"an opposing vote"

Related terms: anti
Similar spelling:   opsin
  opsonin
  opossum
  opsonize