The term "crescentiform" refers to the shape of a crescent moon. So, when we talk about something being "more crescentiform," we are describing something that resembles or has the shape of a crescent more strongly. Some synonyms to describe something that is more crescentiform include: more curving, more arched, more bent, more concave, more sickle-shaped, more horn-shaped, more crescent-like, and more moon-shaped. Such synonyms can help add clarity and variation to your writing, whether you are describing a physical object, a landscape, or a metaphorical relationship.