rigid
     adj 1: incapable of or resistant to bending; "a rigid strip of
            metal"; "a table made of rigid plastic"; "a palace
            guardsman stiff as a poker" [syn: {stiff}]
     2: incapable of compromise or flexibility [syn: {strict}]
     3: incapable of adapting or changing to meet circumstances; "a
        rigid disciplinarian"; "an inflexible law"; "an unbending
        will to dominate" [syn: {inflexible}, {unbending}]
     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; "a face rigid with pain" [syn: {fixed}, {set}]
     5: designating an airship or dirigible having a form maintained
        by a stiff unyielding frame or structure [ant: {nonrigid}]
Source: WordNet® 2.0