I think it's the other way 'round. I think materials that are rigid and hard are called solid.
Bone is a rigid, hard, porous solid organic material
Please describe what you mean by soft and rephrase the question.
Solid, strong, tough, dense, rigid, firm and compact
Rigid materials are types of materials that are unbendable. These materials are hard and cannot be bent, twisted, or flexed.
according to scientists, the lithosphere is solid
difficult.----------------------------------------------------------------------------------------------------------------Compacted, rigid, stiff, solid, strong, tough unyielding.Arduous, bothersome, formidable.
callous, consolidated, dense, firm, impenetrable, rigid, solid, stiff, tough
Rigid polystyrene is a hard plastic Rigid polystyrene is a hard plastic
The definition of a solid is a method object that you can touch and it's hard
A lightweight and rigid.
The velocity of a P wave typically increases when it travels from a solid material to a liquid material. This is because the rigidity of solids allows the P wave to travel faster, while liquids are less dense and less rigid, which can cause the P wave to slow down.
Graphene is considered the most rigid material known to man.