[im.pos.si.ble] adj [ME, fr. MF & L; MF, fr. L impossibilis, fr. in- + possibilis possible] (14c) 1 a: incapable of being or of occurring b: felt to be incapable of being done, attained, or fulfilled: insuperably difficult
2. a: extremely undesirable: unacceptable b: extremely awkward or difficult to deal with -- im.pos.si.ble.ness n