Synonym of observational error

(idiomatic) Synonym of fool's errand

(Internet slang) A period marked by failure, lack of success, or inability to function or thrive.

(fandom slang) A fictional character created as a knock-off of another character whose copyright is owned by a separate entity.

(computing) An error that occurs when an operating system halts, because it has reached a condition where it can no longer operate safely.

(sociology) Synonym of sexual capital