| bedfast | (adjective) confined to bed (by illness) | Synonyms: bedrid, bedridden, sick-abed |
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| colorfast | (adjective) having color that is resistant to fading or running | - |
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| cragfast | (adjective) stranded on or as if on a crag | - |
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| fast | (adjective) acting or moving or capable of acting or moving quickly | - |
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| (adjective) at a rapid tempo | - |
| (adjective) (used of timepieces) indicating a time ahead of or later than the correct time | - |
| (adjective) (of a photographic lens or emulsion) causing a shortening of exposure time | - |
| (adjective) unwavering in devotion to friend or vow or cause | Synonyms: firm, loyal, truehearted |
| (adjective) securely fixed in place | Synonyms: firm, immobile |
| (adjective) hurried and brief | Synonyms: flying, quick |
| (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, libertine, profligate, riotous |
| (adjective) resistant to destruction or fading | - |
| (adjective) (of surfaces) conducive to rapid speeds | - |
| steadfast | (adjective) firm and dependable especially in loyalty | Synonyms: staunch, unswerving |
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| (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steady, stiff, unbendable, unfaltering, unshakable, unwavering |