| friable | (adjective) easily broken into small fragments or reduced to powder | Synonyms: crumbly |
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| fricative | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, sibilant, spirant, strident |
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| frictional | (adjective) pertaining to or worked or produced by friction | - |
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| frictionless | (adjective) lacking all friction | - |
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| fried | (adjective) cooked by frying in fat | Synonyms: deep-fried |
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| friendless | (adjective) excluded from a society | Synonyms: outcast |
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| friendly | (adjective) characteristic of or befitting a friend | - |
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| (adjective) of or belonging to your own country's forces or those of an ally | - |
| (adjective) easy to understand or use | - |
| (adjective) inclined to help or support; not antagonistic or hostile | Synonyms: well-disposed, well disposed |
| frightened | (adjective) made afraid | Synonyms: scared |
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| (adjective) thrown into a state of intense fear or desperation | Synonyms: panic-stricken, panic-struck, panicked, panicky, terrified |
| frightening | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, horrendous, horrific, terrible |
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| frightful | (adjective) provoking horror | Synonyms: atrocious, horrible, horrifying, ugly |
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| (adjective) extremely distressing | Synonyms: fearful |
| (adjective) extreme in degree or extent or amount or impact | Synonyms: awful, terrible, tremendous |
| 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 |
| frigorific | (adjective) causing cold; cooling or chilling | - |
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| frilled | (adjective) having decorative ruffles or frills | Synonyms: frilly, ruffled |
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| frilly | (adjective) having decorative ruffles or frills | Synonyms: frilled, ruffled |
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| fringed | (adjective) having a decorative edging of hanging cords or strips | - |
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| (adjective) surrounded as with a border or fringe; sometimes used in combination | - |
| (adjective) having edges irregularly and finely slashed | Synonyms: laciniate |
| fringy | (adjective) at or constituting a border or edge | Synonyms: marginal |
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| frisky | (adjective) playful like a lively kitten | Synonyms: kittenish |
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| frivolous | (adjective) not serious in content or attitude or behavior | - |
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| frizzly | (adjective) (of hair) in small tight curls | Synonyms: crisp, frizzy, kinky, nappy |
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| frizzy | (adjective) (of hair) in small tight curls | Synonyms: crisp, frizzly, kinky, nappy |
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