not possible; unable to be, exist, happen, etc.
unable to be done, performed, effected, etc.: an impossible assignment.
incapable of being true, as a rumor.
not to be done, endured, etc., with any degree of reason
or propriety: an impossible situation.
utterly impracticable: an impossible plan.
hopelessly unsuitable, difficult, or objectionable.
Origin: 1250–1300; Middle English Related forms
< Latin impossibilis.
6. unbearable, intolerable, unmanageable.