Slakeless is a term that refers to something that cannot be satisfied or quenched. It is often used to describe a person's insatiable thirst or desire. Some synonyms that can be used in place of slakeless include unquenchable, insatiable, insatiate, unsatisfied, and never-ending. These words convey a sense of longing or craving that cannot be fulfilled. Other synonyms for slakeless include inexhaustible, bottomless, unappeasable, and voracious. Each of these words convey the same idea of a never-ending need or desire. Whether used to describe a person's thirst or desire for success, these synonyms for slakeless highlight the intensity and persistence of such feelings.