impossibility
//ˌɪm.pɒs.əˈbɪl.ə.ti//
Noun
impossibilitySingular
impossibilitiesPlural
1
The state or quality of being impossible; something that cannot be done, achieved, or exist.
Finishing this project by tomorrow is an impossibility.
2
Something that is impossible or cannot happen.
Traveling faster than light is a physical impossibility.