[adj] incapable of or resistant to bending; "a rigid strip of metal"; "a table made of rigid plastic"; "a palace guardsman stiff as a poker"
[adj] (aeronautics) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
[adj] incapable of adapting or changing to meet circumstances; "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate"
[adj] fixed and unmoving; "with eyes set in a fixed glassy stare"; "his bearded face already has a set hollow look"- Connor Cruise O'Brien; "a face rigid with pain"
[adj] incapable of compromise or flexibility
fixed, inflexible, intolerant, nonmoving, semirigid, set, stiff, strict, unadaptable, unbending, unmoving