Added 9 October 2026 imperil /ɪmˈpɛɹəl/ verb Categories: Rare Words verb ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about imperil at Wordnik → Where our words come from → Pose a threat to; present a danger to. The pollution is endangering the crops Related Words: jeopardizeperilendangerthreatenmenaceriskharmdamageundermineimpairprejudicecompromise Back to today's word