rigid, 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")
rigid, strict -- (incapable of compromise or flexibility)
inflexible, rigid, unbending -- (incapable of adapting or changing to meet circumstances; "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate")
rigid -- (designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure)
fixed, set, rigid -- (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")
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