| firm | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, loyal, truehearted |
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| (adjective) securely fixed in place | Synonyms: fast, immobile |
| (adjective) strong and sure | Synonyms: strong |
| (adjective) not soft or yielding to pressure | Synonyms: solid |
| (adjective) possessing the tone and resiliency of healthy tissue | - |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely established | - |
| (adjective) not subject to revision or change | - |
| (adjective) (of especially a person's physical features) not shaking or trembling | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: steady, unfluctuating |
| (noun) the members of a business organization that owns or operates one or more establishments | Synonyms: business firm, house |
| (adverb) with resolute determination | Synonyms: firmly, steadfastly, unwaveringly |
| (verb) become taut or tauter | Synonyms: tauten |
| (verb) make taut or tauter | Synonyms: tauten |
| firmament | (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected | Synonyms: celestial sphere, empyrean, heavens, sphere, vault of heaven, welkin |
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| firmamental | (adjective) relating to the firmament or upper regions | - |
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| firmly | (adverb) with firmness | Synonyms: hard |
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| (adverb) with resolute determination | Synonyms: firm, steadfastly, unwaveringly |
| (adverb) in a secure manner; in a manner free from danger | Synonyms: securely |
| firmness | (noun) the quality of being steady or securely and immovably fixed in place | Synonyms: steadiness |
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| (noun) the trait of being resolute | Synonyms: firmness of purpose, resoluteness, resolution, resolve |
| (noun) the property of being unyielding to the touch | - |
| (noun) the muscle tone of healthy tissue | Synonyms: soundness |
| firmware | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: microcode |
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