| fiddle | (noun) bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow | Synonyms: violin |
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| (verb) try to fix or mend | Synonyms: tinker |
| (verb) manipulate manually or in one's mind or imagination | Synonyms: diddle, play, toy |
| (verb) play around with or alter or falsify, usually secretively or dishonestly | Synonyms: monkey, tamper |
| (verb) play the violin or fiddle | - |
| (verb) play on a violin | - |
| (verb) commit fraud and steal from one's employer | - |
| (verb) avoid (one's assigned duties) | Synonyms: goldbrick, shirk, shrink from |
| fiddlehead | (noun) New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible | Synonyms: cinnamon fern, fiddlehead fern, Osmunda cinnamonea |
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| (noun) tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes | Synonyms: Matteuccia struthiopteris, Onoclea struthiopteris, ostrich fern, Pteretis struthiopteris, shuttlecock fern |
| fiddleneck | (noun) hairy annual of California to Mexico with crowded cymes of small blue to lilac or mauve flowers | Synonyms: Phacelia tanacetifolia |
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| fiddler | (noun) a musician who plays the violin | Synonyms: violinist |
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| (noun) an unskilled person who tries to fix or mend | Synonyms: tinkerer |
| (noun) someone who manipulates in a nervous or unconscious manner | Synonyms: twiddler |
| fiddlestick | (noun) a bow used in playing the violin | Synonyms: violin bow |
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| fiddling | (adjective) (informal) small and of little importance | Synonyms: footling, lilliputian, little, niggling, petty, picayune, piddling, piffling, trivial |
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| fidelity | (noun) the quality of being faithful | Synonyms: faithfulness |
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| (noun) accuracy with which an electronic system reproduces the sound or image of its input signal | - |
| fidget | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidgetiness, restlessness |
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| (verb) move restlessly | - |
| fidgetiness | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidget, restlessness |
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| fidgety | (adjective) nervous and unable to relax | Synonyms: antsy, fretful, itchy, restless |
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| fiducial | (adjective) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another) | Synonyms: fiduciary |
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| (adjective) used as a fixed standard of reference for comparison or measurement | - |
| (adjective) based on trust | - |
| fiduciary | (adjective) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another) | Synonyms: fiducial |
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| (noun) a person who holds assets in trust for a beneficiary | - |