Main Entry: im·pos·si·ble

Pronunciation: \(ˌ)im-ˈpä-sə-bəl\

Function: adjective

Etymology: Middle English, from Anglo-French & Latin; Anglo-French, from Latin impossibilis, from in- + possibilis possible

Date: 14th century

1 a : incapable of being or of occurring b : felt to be incapable of being done, attained, or fulfilled : insuperably difficult <an impossible deadline>
2 a : extremely undesirable : unacceptable b : extremely awkward or difficult to deal with <the actor was impossible on the set>

— im·pos·si·ble·ness noun