NYCTANTHOUS Antonyms There are 2 antonyms of the word nyctanthous. (opposite meanings)Did you mean?Definition of NYCTANTHOUSSynonyms of NYCTANTHOUSBest Opposite Words For NYCTANTHOUSTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1diurnaladjectiveadj2diurnallyadverbadv Alternatives for DIURNAL Words (1)circadianOpposite words for diurnal