AIR CASTLE Antonyms There are 5 antonyms of the phrase air castle. (opposite meanings)Did you mean?Definition of AIR CASTLEBest Opposite Words For AIR CASTLETop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1certaintynounn2concretenoun, adjectiven, adj3factnounn4realitynounn5truthnounn Alternatives for CERTAINTY Words (15)surenessassuranceconclusivenessconfidenceconvictiondecisivenessdefinitenessdeterminationfirmnesspositivityreliabilitysafetysecuritysuretycertitudePhrases (2)sure thingforegone conclusionOpposite words for certainty Alternatives for CONCRETE Words (8)tangiblematerialphysicalrealsolidsubstantialtouchablevisibleOpposite words for concrete Alternatives for FACT Words (10)accuracyactualityauthenticitycertaintycertitudegenuinenessrealitysuretytruthverityOpposite words for fact Alternatives for REALITY Words (5)actualityrealismrealnesstruthworldOpposite words for reality Alternatives for TRUTH Words (16)accuracyverityactualityauthenticitycorrectnessexactnessfactgenuinenesshonestyintegrityprecisionrealitysincerityvalidityveracitytruenessPhrases (3)sojourner truththe truetrue statementOpposite words for truth