| Term | Definition |
| fabrication | a lie; something made up |
| facetious | humorous; not serious; clumsily humorous |
| facile | fluent; skillful in a superficial way; easy |
| faction | minority within a larger group; disagreement within an organization |
| farcical | absurd; ludicrous |
| fastidious | meticulous; demanding; finicky |
| fatalist | s.o. who believes that future events are pre-determined and that humans are powerless to change them |
| fatuous | foolish; silly; idiotic |
| fauna | animals |
| fecund | fertile; productive |
| felicity | happiness; an appropriate and pleasing manner or style |
| fervor | great warmth or earnestness; ardor; zeal |
| fetter | to restrain; to hamper |
| fidelity | faithfulness; loyalty |
| figurative | based on figures of speech; metaphorical |
| finesse | skillful maneuvering; subtlety; craftiness |
| flagrant | glaringly bad; notorious; scandalous |
| flaunt | show off; to display ostentatiously |
| flout | to treat with disdain, scorn, or contempt; scoff at; mock |
| foible | minor character flaw |
| foment | to stir up; to instigate |
| forbear | to refrain from ; to abstain |
| forgo | to do without ; to forbear |
| forsake | v to abandon ; to renounce ; to relinquish |
| fortuitous | accidental ; occurring by chance |
| founder | v to fail ; to collapse ; to sink |
| fraternal | like brothers |
| frenetic | frantic ; frenzied |
| frugal | economical ; penny-pinching |
| furtive | secretive ; sly |
| futile | useless ; hopeless |