13
opponent(noun, person, enemy, ally)
10
enemy
6
foe(noun, enemy)
5
antagonist(noun, enemy)
4
competition
3
opposer(noun, enemy)
2
adversary
2
detractor(noun, enemy)
2
proud
2
stranger
1
chief
1
rival
1
challenger
1
commander
1
commanding
1
conflicting
1
contender
1
contestant
1
critic
1
cynic
11 years ago|711 views|share |citing 
APASmart Define. (2015). colleague thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/colleague/thesaurus/antonyms
ChicagoSmart Define. 2015. "colleague thesaurus" https://smartdefine.org/colleague/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2015, colleague thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/colleague/thesaurus/antonyms>.
MLASmart Define. "colleague thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/colleague/thesaurus/antonyms>