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rigid | [in aeronautics] designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure | |
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rigid, strict | incapable of compromise or flexibility | |
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fixed, set, rigid | fixed and unmoving | |
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rigid, inflexible, unbending | incapable of adapting or changing to meet circumstances | |
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rigid, stiff | incapable of or resistant to bending |