rigid

adjective

1. 1

   incapable of or resistant to bending

   a rigid strip of metal

   a table made of rigid plastic

2. 2

   designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure

3. 3

   incapable of adapting or changing to meet circumstances

   a rigid disciplinarian

   an inflexible law

4. 4

   fixed and unmoving

   with eyes set in a fixed glassy stare

   his bearded face already has a set hollow look"- Connor Cruise O'Brien

5. 5

   incapable of compromise or flexibility