Worser
Worser is a nonstandard word in the English language, used informally as a comparative adjective. It is derived from the adjective "bad," and is intended to mean "more bad." The standard comparative form of "bad" is "worse." Therefore, "worser" is considered a double comparative.
The use of "worser" is generally considered grammatically incorrect in formal contexts, such as academic writing
Linguistically, "worser" falls into the category of nonstandard grammar. While it is understood by many English