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plain(adjective, vague, unclear, ambiguous)
10 years ago|4k views|share |citing 
APASmart Define. (2016). formal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/formal/thesaurus/antonyms
ChicagoSmart Define. 2016. "formal thesaurus" https://smartdefine.org/formal/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, formal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/formal/thesaurus/antonyms>.
MLASmart Define. "formal thesaurus" 10 March 2016. Web. 24 September 2026. <https://smartdefine.org/formal/thesaurus/antonyms>