When it comes to describing something as "rapier-like," there are a number of synonyms that can help convey the same sense of precision and sharpness. For instance, "lancet-like" suggests a similarly pointed object with a thin blade, while "needle-like" has connotations of extreme fineness and delicacy. "Sword-like" invokes the same kind of weapon as a rapier, but emphasizes its length and potential for swift strikes. Other options might include "scalpel-like," "stiletto-like," or "razor-like," each of which imparts a slightly different nuance while still emphasizing the idea of something razor-sharp and highly efficient.