Optional
Optional adjective - Subject to one's freedom of choice.
Unavoidable is an antonym for optional.
Nearby Words: option, optionally
Unavoidable
Both words in one sentence
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Black Frost can be recruited a while after you defeat him as an optional boss, Dante automatically joins you in the Fifth Kalpa (which is entirely optional, but unavoidable if you're going for the True Demon Ending), and Samael will only join you if you chose to side with Shijima.
Source: Optional Party Member - All of the other fights are optional, but they can get you neat stuff that will make your life easier when fighting truly becomes unavoidable.
Source: Videogame / Visions & Voices - Killing is kind of unavoidable in the Grand Theft Auto series, but many people have tried to not kill anyone as they go about the optional objectives - trying not to run over people on the sidewalk, etc.
Source: Pacifist Run
Cite this Source
Unavoidable and Optional. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/optional/unavoidable
Optional & Unavoidable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/optional/unavoidable>.
Unavoidable or Optional. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/optional/unavoidable.
Google Ngram Viewer shows how "optional" and "unavoidable" have occurred on timeline