UNSUBSTANTIAL Antonyms There are 7 antonyms of the word unsubstantial. (opposite meanings)Did you mean?Definition of UNSUBSTANTIALAlso try opposite words for..unsubstantiallyunsubstantialityunsubstantializeBest Opposite Words For UNSUBSTANTIALTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1concretenoun, adjectiven, adj2materialnoun, adjectiven, adj3realadjectiveadj4solidnoun, adjectiven, adj5substantialadjectiveadj6tangibleadjectiveadj7weightyadjectiveadj Alternatives for CONCRETE Words (8)tangiblematerialphysicalrealsolidsubstantialtouchablevisibleOpposite words for concrete Alternatives for MATERIAL Words (8)clothcorporealfabricmundanerealstuffsubstantialtextileOpposite words for material Alternatives for REAL Words (22)actualgenuineauthenticmaterialsubstantialtangibletrueconcretehonestphysicalsinceresolidvalidveritableexistentheartfeltliteralrattlingreallyveridicalveryreiPhrases (2)bona fidereal numberOpposite words for real Alternatives for SOLID Words (23)substantialfirmstrongcompactconcretedensehardrigidrobuststablesturdyunyieldingclosedmassiveheartysatisfyingself-coloredself-colouredsolidnesssquareunanimousupstandingwholeOpposite words for solid Alternatives for SUBSTANTIAL Words (14)solidaffluentflushheartyloadedmaterialmoneyedrealsatisfyingsignificantsquarestrongsubstantivewealthyOpposite words for substantial Alternatives for TANGIBLE Words (8)palpablerealtouchableconcretematerialphysicalsolidtactileOpposite words for tangible Alternatives for WEIGHTY Words (17)graveheavyconsequentialimportantmeaningfulmomentousponderousserioussignificantsubstantialweightycogentcorpulentgrievousobeserotundtellingOpposite words for weighty