Added 9 October 2026 unimaginable /ˌʌnɪˈmædʒɪnəbəl/ adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about unimaginable at Wordnik → Where our words come from → Totally unlikely. Origin From un- + imagine + -able. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: unthinkableinconceivableimpossibleinexplicableindescribableunbelievableincomprehensibleincalculableunspeakableincredibleunintelligible Back to today's word