When it comes to referring to something as "most razorsharp," there are many synonyms that can be used. Some common alternatives include "extremely sharp," "ultra-sharp," "keen-edged," "razor-edged," "razor-thin," "needle-sharp," "sculptor's sharp," and "scalpel-sharp." Each of these synonyms conveys a similar level of sharpness, precision, and accuracy. However, selecting the most appropriate synonym will depend on the context of the sentence and the tone of the writing. In any case, these synonyms can add depth and variety to your language while helping to communicate your idea with stronger impact.