Optional
Optional adjective - Subject to one's freedom of choice.
Unreasonable and optional are semantically related. In some cases you can use "Unreasonable" instead an adjective "Optional".
Nearby Words: option, optionally
Unreasonable
Unreasonable adjective - Having no basis in reason or fact.
Optional and unreasonable are semantically related. Sometimes you can use "Optional" instead an adjective "Unreasonable".
Mutual synonyms
Both words in one sentence
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Much of it is optional, and there are things brought up that it's not unreasonable to believe your character is unfamiliar with, but once in a while, you can ask about something your character really should know all about.
Source: As You Know
Cite this Source
Unreasonable and Optional. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/optional/unreasonable
Optional & Unreasonable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/optional/unreasonable>.
Unreasonable or Optional. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/optional/unreasonable.
Google Ngram Viewer shows how "optional" and "unreasonable" have occurred on timeline