definition of
[rigid]

[1] #1 rigid s. [stiff] incapable of or resistant to bending; "a rigid strip of metal"; "a table made of rigid plastic"; "a palace guardsman stiff as a poker"; "stiff hair"; "a stiff neck". wn

[2] #2 rigid s. [strict] incapable of compromise or flexibility. wn

[3] #3 rigid s. [inflexible, unbending] incapable of adapting or changing to meet circumstances; "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate". wn

[4] #4 rigid a. designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure. wn