| fuscous | (adjective) of something having a dusky brownish grey color | Synonyms: taupe |
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| fused | (adjective) joined together into a whole | Synonyms: amalgamate, amalgamated, coalesced, consolidated |
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| fusible | (adjective) capable of being melted and fused | - |
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| fusiform | (adjective) tapering at each end | Synonyms: cigar-shaped, spindle-shaped |
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| fussy | (adjective) overcrowded or cluttered with detail | Synonyms: busy |
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| (adjective) annoyed and irritable | Synonyms: bad-tempered, crabbed, crabby, cross, grouchy, grumpy, ill-tempered |
| (adjective) exacting especially about details | Synonyms: finical, finicky, particular, picky |
| fusty | (adjective) old-fashioned and out of date | Synonyms: nonprogressive, standpat, unprogressive |
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| (adjective) stale and unclean smelling | Synonyms: frowsty, musty |