From Wiktionary, the free dictionary
From אִי־ (í-) + אֶפְשָׁר (efshár).
אִי־אֶפְשָׁר • (í-efshár)
- (impersonal) impossible, not possible
אי אפשר לעשות פה כלום.- í efshár la'asót po klum.
- It's not possible to do anything here.
- (impersonal) forbidden, not allowed