rigid (adj.)incapable of or resistant to bending;
a table made of rigid plastic
rigid (adj.)incapable of compromise or flexibility;
rigid (adj.)incapable of adapting or changing to meet circumstances;
rigid (adj.)designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure;
rigid (adj.)fixed and unmoving; "his bearded face already has a set hollow look"- Connor Cruise O'Brien;