Idea
Opinion
Opinion noun - An idea that is believed to be true or valid without positive knowledge.
Usage example: a number of voters expressed the opinion that all politicians, regardless of party affiliation, are corrupt
Idea is a synonym for opinion in belief topic. You can use "Idea" instead a noun "Opinion", if it concerns topics such as feeling, view, creed, theory. popular alternative
Nearby Words: opinionated, opined, opining
Mutual synonyms
How words are described
Both words in one sentence
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A Know-Nothing Know-It-All is a character who insists he or she knows everything; is always right; that they were the ''actual'' original creator of an idea; and who generally has an extremely high opinion of themselves and their abilities.
Source: Know-Nothing Know-It-All -
She basically chews him out and tells him he's only doing this because he likes to go against the popular opinion, and once the popular idea is something else, he switches.
Source: Awesome / Family Guy - The Cobbler's Children Have No Shoes: Gardevoir seems to have an idea of what's wrong with her, but as the only psychologist in the series, she can't really get a second opinion.
Source: Webcomic / Level 30 Psychiatry
Cite this Source
Opinion and Idea. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/idea/opinion
Idea & Opinion. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/idea/opinion>.
Opinion or Idea. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/idea/opinion.
Google Ngram Viewer shows how "idea" and "opinion" have occurred on timeline