| FIDEIST | • fideist n. A subscriber to fideism. • FIDEIST n. a believer in fideism, the doctrine that knowledge depends on faith over reason. |
| FIFTIES | • fifties n. Plural of fifty. • fifties n. The decade of the 1850s, 1950s, etc. • fifties n. The decade of one’s life from age 50 through age 59. |
| FIKIEST | • FIKY adj. (Scots) fidgeting and restless, also FIKISH. |
| FINITES | • FINITE n. a verb limited by person, number, tense or mood. |
| FINLITS | • FINLIT n. (colloquial) financial literacy. |
| FISTIER | • FISTY adj. like a fist. |
| FISTING | • fisting v. Present participle of fist. • fisting n. (Slang) The sexual practice of inserting one or both hands into the vagina or rectum of one’s sexual partner. • FISTING n. a homosexual erotic practice. |
| FOILIST | • foilist n. (Fencing) A fencer who fights with a foil. • FOILIST n. one who fences with a foil. |
| IFFIEST | • iffiest adj. Superlative form of iffy: most iffy. • IFFY adj. full of uncertainty. |
| MISFITS | • misfits n. Plural of misfit. • misfits v. Third-person singular simple present indicative form of misfit. • MISFIT v. to fit badly. |
| NIFTIES | • nifties n. Plural of nifty. • NIFTY n. a joke, a witty remark or story. |
| POSITIF | • POSITIF n. (French) a feature on older organs, manually controlling soft stops. |
| SEMIFIT | • semifit adj. Somewhat physically fit. • SEMIFIT adj. conforming somewhat to the lines of the body. |
| SIFTING | • sifting v. Present participle of sift. • sifting n. The act by which something is sifted. • sifting n. (In the plural) The material which falls through a sieve. |
| STIFFIE | • stiffie n. Alternative form of stiffy. • STIFFIE n. (vulgar slang) an erect penis, also STIFFY. |
| SWIFTIE | • swiftie n. Someone or something that moves swiftly. • swiftie n. Alternative form of Tom Swifty. • Swiftie n. (Slang) A fan of American singer-songwriter and actress Taylor Swift. |
| TIFFINS | • tiffins n. Plural of tiffin. • Tiffins prop.n. Plural of Tiffin. • TIFFIN v. to take lunch. |
| TIPSIFY | • tipsify v. (Colloquial, transitive) To make tipsy. • TIPSIFY v. to make tipsy. |