The antonyms for "more razor-sharp" are "dull," "blunt," and "blunt-edged." These words signify a lack of sharpness, precision, or accuracy. A dull or blunt object will not cut or slice cleanly, making it difficult or impossible to complete tasks that require precision. In contrast, a razor-sharp tool or weapon is sharp enough to cut, slice, or pierce with ease. In some cases, the word "dull" can also imply a lack of interest or enthusiasm, while "razor-sharp" can suggest intelligence, wit, or insight. So, while these antonyms may refer to physical sharpness, they can also have broader connotations related to mental sharpness or dullness.