The antonym for the phrase "more razor sharp" would be "dull" or "blunt." These words indicate a lack of sharpness or precision, which is the opposite of what the original phrase implies. Other antonyms for "more razor sharp" might include words like "coarse," "imprecise," or "blurred," which all describe qualities that are opposite to the sharpness and clarity conveyed by the original phrase. By using antonyms, we can bring greater depth and nuance to our language, as well as highlighting the contrast between different qualities or states.