This adjective means impossible or inadmissible—literally 'not receivable.' Jesus uses it in Luke 17:1 to introduce his teaching about temptations: 'It is impossible that temptations should not come.' The term appears in later medical and philosophical texts for things that cannot be admitted or accepted. All four translation languages employ their standard word for 'impossible,' showing clear consensus. The German preserves the Greek form, maintaining the emphatic position Jesus gives it in his statement about the inevitability of stumbling blocks.