Word parts un- + sure Pronunciation IPA (key): /ʌnˈʃʊə/ or /ʌnˈʃɔː/ Audio (UK)(file) Adjective Positive unsure Comparative more unsure Superlative most unsure If you are unsure about something, you are not certain or still deciding. Synonym: uncertainWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads