rigid

Meanings

• incapable of or resistant to bending
  • "a rigid strip of metal"
  • "a table made of rigid plastic"
• incapable of compromise or flexibility
• incapable of adapting or changing to meet circumstances
  • "a rigid disciplinarian"
• designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
• fixed and unmoving; ; - Connor Cruise O'Brien
  • "a face rigid with pain"

Synonyms

fixed, inflexible, set, stiff, strict, unbending