Incogitancy, meaning lack of thought or consideration, has several synonyms that can be used interchangeably depending on the context. One alternative is thoughtlessness, which implies a careless or heedless disposition. Another synonym is inattention, which suggests a lack of focus or concentration. Alternatively, one may use indifference, which connotes disinterest or apathy, or insouciance, which implies a nonchalant attitude. Other synonyms for incogitancy include neglect, forgetfulness, obliviousness, and unawareness. Regardless of the specific term used, all synonyms for incogitancy refer to a lack of mental engagement or effort. These synonyms can be used to help add variety and clarity to one's writing or speech.