impossibles
im-pos-si-bles
noun
Things or tasks considered impossible to achieve or overcome.
"They were challenged to accomplish the impossibles."
Thesaurus
Synonyms: intolerable, impossible, unacceptable, unbearable, unendurable, infeasible, hopeless, unworkable, unachievable, unrealizable, undoable, impracticable
Antonyms: possible