PLAIN Synonyms: 454 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/plain
WEBSynonyms for PLAIN: simple, unadorned, naked, bare, undecorated, unvarnished, bald, clean; Antonyms of PLAIN: fancy, decorated, loud, gaudy, showy, ornamented, garish, flashy
DA: 82 PA: 54 MOZ Rank: 50