The word "sickle-shaped" is often used to describe something that is curved, crescent-shaped, or hook-shaped. However, there are several synonyms for this term that can add variety and nuance to your writing. Some common alternatives include "scythe-like," "curved," "bent," "arched," and "hooked." Additionally, you could use more specific terms to describe the shape in question, such as "falcate," "lunate," "crescentiform," or "semilunar." When choosing synonyms for "sickle-shaped," consider the connotations and tone of your writing, as well as the specific object or phenomenon you are describing.