| frigid | (adjective) extremely cold | Synonyms: arctic, gelid, glacial, icy, polar |
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| (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frosty, frozen, glacial, icy, wintry |
| (adjective) sexually unresponsive | Synonyms: cold |
| nonrigid | (adjective) designating an airship having a shape maintained only by internal gas pressure and without a supporting structure | - |
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| rigid | (adjective) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure | - |
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| (adjective) incapable of or resistant to bending | Synonyms: stiff |
| (adjective) incapable of compromise or flexibility | Synonyms: strict |
| (adjective) fixed and unmoving | Synonyms: fixed, set |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: inflexible, unbending |
| semirigid | (adjective) not fully rigid | - |
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| (adjective) having a form maintained by a rigid internal structure as well as by internal gas pressure | - |