Invariable and Rigid

Invariable adjective - Not capable of changing or being changed.

Rigid is a synonym for invariable in state topic. In some cases you can use "Rigid" instead an adjective "Invariable", when it comes to topics like regular, flexible, not changing.

Nearby Words: invariability, invariably, invariant

Rigid adjective - Not allowing for any exceptions or loosening of standards.

Invariable is a synonym for rigid in state topic. You can use "Invariable" instead an adjective "Rigid", if it concerns topics such as fixed, inflexible, stiff, flexible.

Nearby Words: rigor, rigidity, rigidly