| FAULTIEST | • faultiest adj. Superlative form of faulty: most faulty. • FAULTY adj. imperfect. |
| FISTULATE | • fistulate v. (Obsolete, transitive, intransitive) To make or become hollow like a fistula, or pipe. • fistulate adj. Hollowed like a fistula. • FISTULATE adj. hollow and cylindrical, like a pipe or reed, also FISTULAR, FISTULOSE, FISTULOUS. |
| FLATULENT | • flatulent adj. Affected by gas in the intestine; likely to fart. • flatulent adj. (Obsolete) Empty; vain. • FLATULENT adj. suffering from flatulence. |
| FLAUTISTS | • flautists n. Plural of flautist. • FLAUTIST n. one who plays the flute, also FLUTIST, FLUTER. |
| FLUCTUANT | • fluctuant adj. That fluctuates or causes fluctuation. • fluctuant adj. (Medicine) Used to describe a fluid-filled structure, such as an abscess, that produces a wave-like… • FLUCTUANT adj. moving like a wave. |
| FLUCTUATE | • fluctuate v. (Intransitive) To vary irregularly; to swing. • fluctuate v. (Intransitive) To undulate. (Can we add an example for this sense?) • fluctuate v. (Intransitive) To be irresolute; to waver. |
| FLUSTRATE | • flustrate v. (Colloquial) To fluster. • FLUSTRATE v. (obsolete) to fluster. |
| FOOTFAULT | • footfault v. (Tennis, intransitive) To commit a foot fault. • foot␣fault n. (Sports) In certain sports, as in tennis or long jump, a fault in which the athlete’s foot is in the… • FOOTFAULT v. to commit a serving fault at tennis. |
| MATTERFUL | • matterful adj. Full of matter or material; pithy; informative. • MATTERFUL adj. (archaic) full of matter, pithy. |
| OUTFLOATS | • outfloats v. Third-person singular simple present indicative form of outfloat. • OUTFLOAT v. to float longer than. |
| POSTFAULT | • postfault adj. After a fault. • POSTFAULT adj. taking place after a fault. |
| TACTFULLY | • tactfully adv. In a tactful manner. • TACTFUL adv. having tact. |
| THREATFUL | • threatful adj. Threatening. • THREATFUL adj. full of threats; having a menacing appearance. |
| ULTRAFAST | • ultrafast adj. Very fast, or of very short duration; especially concerning events that take place in femtosecond or… • ultra-fast adj. Alternative form of ultrafast. • ULTRAFAST adj. very fast. |
| ULTRALEFT | • ultraleft adj. (Politics) Extremely left-wing. • ultraleft n. A person of extremely left-wing political beliefs. • ULTRALEFT n. the very far left in politics. |
| ULTRASOFT | • ultrasoft adj. Extremely soft; of utmost softness. • ultrasoft adj. (Motorsports) Softer than supersoft, and harder than hypersoft. • ultrasoft n. (Motorsports) Ellipsis of ultrasoft tyre. |
| UNTACTFUL | • untactful adj. Not tactful. • UNTACTFUL adj. not tactful. |