WordWeb Online

1. Incapable of or resistant to bending
   "a rigid strip of metal"; "a table made of rigid plastic";
   - stiff
    
2. Incapable of compromise or flexibility
   - strict
    
3. Incapable of adapting or changing to meet circumstances
   "a rigid disciplinarian";
   - inflexible, unbending
    
4. (aeronautics) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
    
5. Unchanging and unmoving
   "a face rigid with pain";
   - fixed, set

See also: inflexible, intolerant, nonmoving, semirigid, unadaptable, unmoving

Antonym: nonrigid

Encyclopedia: Rigid