Soft-finned is a term often used to describe fish that have fins that lack spines. In order to describe such fish effectively, it may be useful to have a list of synonyms. Some synonyms for soft-finned could include "non-spiny," "flexible-finned," "flabby-finned," "smooth-finned," and "spineless." Additionally, some alternative terms that could be used to describe fish with soft fins include "rayless," "cartilaginous," or "chondricthyan" (if referring specifically to sharks, rays, and chimaeras). When writing about fish, it is important to use clear and accurate language, and having a variety of synonyms to choose from can help achieve this goal.