MANTISSAS Antonyms There are 2 antonyms of the word mantissas. (opposite meanings)Did you mean?Definition of MANTISSASBest Opposite Words For MANTISSASTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1mainnoun, adjectiven, adj2integersnoun, adjectiven, adj Alternatives for MAIN Words (14)chiefprimaryprincipalcentralessentialfundamentalkeyleadingmajorpredominantlargestbrinyindependentmasterOpposite words for main