What does flexibility, suppleness, stiffness, softness mean?
These terms are all used to describe the same property. A fishing line that is stiff is more difficult to cast with a fixed spool reel than a soft, flexible fishing line that snugs down nicely on the spool and glides smoothly through the rings. Mono that is stiff tends to spring off the reel spool and build “birds nests”. It has a greater memory effect than a multifilament. Multifilament Dyneema lines are soft and supple, only coated braids can be rather stiff. However, even such braids have a low memory effect as the outer coating is soft and deforms easily, similar to copper wire.