Added 9 October 2026 irrationally /ɪəˈɹæ.ʃə.nə.li/ adverb Categories: Describing WordsRare Words adverb ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about irrationally at Wordnik → Where our words come from → In an irrational manner; without reason; in a manner contrary to reason. Related Words: unreasonablyillogicallyreasonlesslyalogicallyrationallyunlogicallywrongmindedlymadlysubrationallycrazilynonsensically Back to today's word