The phrase "more razorsharp" implies an extreme level of sharpness, which is hard to match with any antonym. However, there are a few antonyms that could be used to describe the opposite of razorsharp. These include dull, blunt, and clumsy. When describing a tool or weapon, these antonyms suggest a lack of effectiveness or sharpening. In contrast, the phrase "more razorsharp" implies precision, accuracy, and power. Overall, while there are antonyms for razorsharp, they do not capture the same level of intensity, but instead describe the opposite end of the sharpness spectrum.