ETYM Latin rigidus, from rigere to be stiff or numb: cf. French rigide. Related to Rigor.
1. Incapable of or resistant to bending; SYN. stiff.
2. Incapable of compromise or flexibility; SYN. strict.
3. (Aeronautics) Designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure.

1. Having a sharp inclination
2. Of a slope; set at a high angle

1. Lacking ease in bending; not limber
2. Hard to overcome or surmount; SYN. uphill.
3. Not moving or operating freely
4. Powerful