Toothier, meaning having more teeth or sharper teeth, can be described with antonyms such as toothless, blunt, or dull. Toothless refers to the absence of teeth or having teeth that are worn down, while blunt describes a lack of sharpness. Dull, on the other hand, can refer to the lack of sharpness or intensity in something, including teeth. Other antonyms that can be used to describe something that is not toothier include smooth, flat, or even. These words help to negate the sharpness or jaggedness that is associated with toothier objects or beings, providing a clear contrast in meaning.