| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| confidant | (noun) someone to whom private matters are confided | Synonyms: intimate |
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| confidante | (noun) a female confidant | - |
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| confidence | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, authority, self-assurance, self-confidence, sureness |
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| (noun) a secret that is confided or entrusted to another | - |
| (noun) a feeling of trust (in someone or something) | - |
| (noun) a state of confident hopefulness that events will be favorable | - |
| (noun) a trustful relationship | Synonyms: trust |
| confidentiality | (noun) discretion in keeping secret information | - |
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| (noun) the state of being secret | - |
| diffidence | (noun) lack of self-confidence | Synonyms: self-distrust, self-doubt |
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| 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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| 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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| 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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| fidgetiness | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidget, restlessness |
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| fiduciary | (noun) a person who holds assets in trust for a beneficiary | - |
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| infidel | (noun) a person who does not acknowledge your god | Synonyms: gentile, heathen, pagan |
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| infidelity | (noun) the quality of being unfaithful | Synonyms: unfaithfulness |
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| overconfidence | (noun) total certainty or greater certainty than circumstances warrant | Synonyms: certitude, cocksureness |
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| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| sulfide | (noun) a compound of sulphur and some other element that is more electropositive | Synonyms: sulphide |
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