NULL Antonyms There are 4 antonyms of the word null. (opposite meanings)Did you mean?Definition of NULLAlso try opposite words for..nullifynullitynullificationBest Opposite Words For NULLTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1effectiveadverb, adjectiveadv, adj2existingadjectiveadj3operativenoun, adjectiven, adj4validadjectiveadj Alternatives for EFFECTIVE Words (21)efficientadvantageouscapablecompetentexpedientfruitfulfunctionalimpressiveinfluentialoperativepotentpowerfulproductivereliablesuccessfulusefulvaluableimpactfulefficaciouseffectualgoodPhrases (2)in effectin forceOpposite words for effective Alternatives for EXISTING Words (14)liveactivealiveavailablebeingexistingfunctioningoperativerunningsurvivingbeexistentsubsistsurviveOpposite words for existing Alternatives for OPERATIVE Words (7)functionalpirunningshamussherlocksurgicalworkingPhrases (6)intelligence agentintelligence officerprivate detectiveprivate eyeprivate investigatorsecret agentOpposite words for operative Alternatives for VALID Words (16)acceptableapprovedauthenticconclusivecorrectcredibleeffectivegenuinejustlegitimateproperrecognizedreliablesoundtruewell-foundedOpposite words for valid