pretentiousness n. + Add to list UK //pɹɪtˈɛnʃəsnəs// pre·ten·tious·ness SynonymsAntonymsEtymology Synonyms inflationlargenessostentationostentatiousnesspompositypompousnesspretensionpuffinesssplashiness Antonyms unpretentiousnessOrigin From pretentious + -ness.