| falcate | (adjective) curved like a sickle | Synonyms: falciform, sickle-shaped |
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| falciform | (adjective) curved like a sickle | Synonyms: falcate, sickle-shaped |
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| falconine | (adjective) relating to or resembling a falcon | - |
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| fallacious | (adjective) involving deception | Synonyms: deceitful, fraudulent |
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| (adjective) based on an incorrect or misleading notion or information | - |
| (adjective) containing or based on a fallacy | Synonyms: unsound |
| fallen | (adjective) killed in battle | - |
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| (adjective) having fallen in or collapsed | - |
| (adjective) having dropped by the force of gravity | - |
| (adjective) having lost your chastity | - |
| fallible | (adjective) likely to fail or make errors | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: frail, imperfect, weak |
| falling | (adjective) becoming lower or less in degree or value | - |
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| (adjective) decreasing in amount or degree | - |
| (adjective) coming down freely under the influence of gravity | Synonyms: dropping |
| fallow | (adjective) undeveloped but potentially useful | - |
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| (adjective) left unplowed and unseeded during a growing season | - |
| false | (adjective) not in accordance with the fact or reality or actuality | - |
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| (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: fake, faux, imitation, simulated |
| (adjective) adopted in order to deceive | Synonyms: assumed, fictitious, fictive, pretended, put on, sham |
| (adjective) designed to deceive | - |
| (adjective) (used especially of persons) not dependable in devotion or affection; unfaithful | Synonyms: untrue |
| (adjective) arising from error | Synonyms: mistaken |
| (adjective) inaccurate in pitch | Synonyms: off-key, sour |
| (adjective) deliberately deceptive | - |
| (adjective) erroneous and usually accidental | - |
| (adjective) inappropriate to reality or facts | Synonyms: delusive |
| falsetto | (adjective) artificially high; above the normal voice range | - |
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| falsifiable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: confirmable, verifiable |
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| faltering | (adjective) unsteady in speech or action | - |
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