"Razor-edged" refers to something that is extremely sharp. Its synonyms include "sharp-edged," "keen-edged," "cutting," "acute," "pointed," "well-honed," "razor-sharp," "fine," and "narrow-bladed." Each of these words can be used to describe a sharp object or a sharp edge, whether it's a cutting tool, a knife, or a blade. In addition, "razor-edged" can be used metaphorically to describe something that is unsettling or tense, such as a conversation or a situation. In this sense, synonyms might include "tense," "edgy," "nervous," or "uneasy".