| faced | (adjective) having a face or facing especially of a specified kind or number; often used in combination | - |
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| faceless | (adjective) without a face or identity | - |
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| faceted | (adjective) having facets | - |
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| facetious | (adjective) cleverly amusing in tone | Synonyms: bantering, tongue-in-cheek |
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| facial | (adjective) of or concerning the face | - |
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| (adjective) of or pertaining to the outside surface of an object | - |
| facile | (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, fluent, silver-tongued, silver, smooth-spoken |
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| (adjective) performing adroitly and without effort | - |
| (adjective) superficially impressive, but lacking depth and attention to the true complexities of a subject | Synonyms: neat, slick |
| facilitative | (adjective) freeing from difficulty or impediment | - |
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| facilitatory | (adjective) inducing or aiding in facilitating neural activity | - |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| factorial | (adjective) of or relating to factorials | - |
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| factual | (adjective) of or relating to or characterized by facts | - |
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| (adjective) existing in act or fact | Synonyms: actual |
| facultative | (adjective) able to exist under more than one set of conditions | - |
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| (adjective) of or relating to the mental faculties | - |
| (adjective) granting a privilege or permission or power to do or not do something | - |
| (adjective) optional | Synonyms: elective |