Pronunciation (UK) IPA (key): /ˈæmpɑːs/ (US) IPA (key): /ˈɪmpæs/ Audio (UK)(file) Noun Singular impasse Plural impasses (countable) An impasse is a situation in which no progress can be made. Synonyms: deadlock and stalemateWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads