strangeness n. + Add to list US //ˈstɹeɪndʒnəs// UK //stɹˈeɪndʒnəs// strange·ness SynonymsAntonymsEtymology Synonyms curiousnessforeignnessunfamiliarity Antonyms familiaritynativenessOriginMEstraungenesse→ENstrangeness From Middle English straungenesse; equivalent to strange + -ness. Idioms1 entry01high strangenessA quality of being peculiar, bizarre, utterly absurd.