impracticable
C2Adjektiv/US /ˌɪmprˈæktɪkəbəl/ ĭmpr-ĂKT-ĭk-əb-əl; UK /ˌɪmprˈæktɪkəbəl/ ĭmpr-ĂKT-ĭk-əb-əl/
Not practicable; incapable of being performed, or accomplished by the means employed, or at command; impossible; as, an impracticable undertaking.
