SIS Antonyms There are 9 antonyms of the word sis. (opposite meanings)Did you mean?Definition of SISAlso try opposite words for..sissiessisterssisterlyBest Opposite Words For SISTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1brothernounn2boynounn3dudenounn4fellownoun, adjectiven, adj5gentlemannounn6guynounn7mannounn8bronoun, adjectiven, adj9male siblingnoun, adjectiven, adj Alternatives for BROTHER Words (6)buddychumcomradecronypalsidekickPhrases (1)blood brotherOpposite words for brother Alternatives for BOY Words (9)sonbratchapguyknaveladmanservantmatesquirtPhrases (1)male childOpposite words for boy Alternatives for DUDE Words (15)dandyfopbeaublokebusterchapclotheshorsecovefellowgallantguymashermatesheikswellPhrases (1)fashion plateOpposite words for dude Alternatives for FELLOW Words (35)associatecolleaguecompanioncomrademateallybuddychumco-workercohortcollaboratorcompatriotcompeerconfederatecounterpartfriendpalpartnerbeaublighterblokeboyfriendbusterchapconfrerecussdudefamiliarfellafellerfellowgentladschoolfellowswainOpposite words for fellow Alternatives for GENTLEMAN Words (5)cockneydilettantesahibmanvaletPhrases (2)gentleman's gentlemanvalet de chambreOpposite words for gentleman Alternatives for GUY Words (20)blokechapdudefellowgentlemanguymanblackguardbozobrothercatcovefellageezerhombreribridiculeroastsodbroPhrases (7)guy cableguy ropeguy wirejest atlaugh atmake funpoke funOpposite words for guy Alternatives for MAN Words (12)humangentlemanhumanityhumankindhumansmalemankindpersonpieceservicemanvaletworldPhrases (9)adult malegentleman's gentlemanhuman beinghuman beingshuman raceisle of manmilitary manmilitary personnelvalet de chambreOpposite words for man Alternatives for BRO Words (5)amigobuddydudematepalOpposite words for bro