One who or that which is not wanted; an undesirable.
"The stray dog was considered an unwanted guest in the quiet neighborhood."
In plain English: An unwanted is something that someone does not want and tries to get rid of because it causes trouble or annoyance.
"The unwanted was found in the corner behind stacks of old newspapers."
Usage: Although often used as an adjective, the noun form refers specifically to people or things that are rejected or disliked rather than simply unrequested items. Use this term when emphasizing a negative attitude toward someone's presence instead of neutral alternatives like "uninvited guest."
not wanted
"undesirable impurities in steel"
"legislation excluding undesirable aliens"
"removed the unwanted vegetation"
Not wanted; unwelcome.
"The unsolicited email was an unwanted message that made me feel annoyed."
The word unwanted is formed by adding the prefix un- to wanted to create its current meaning. It entered English as a straightforward combination of these two existing elements rather than through a complex historical shift.