Simple Definition of nemesis

from our Learner's Dictionary

nemesis

noun

ˈnɛməsəs How to pronounce nemesis (audio)
plural nemeses -ˌsiːz How to pronounce nemesis (audio)
: an opponent or enemy that is very difficult to defeat
He will be playing his old nemesis for the championship.

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“Nemesis.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/nemesis. Accessed 15 Jun. 2026.

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