| FERNALLIES | • FERNALLY n. a vascular flowerless plant, a pteridophyte, other than a fern. |
| FERRELLING | • FERREL v. to fit with a metal cap to prevent splitting, also FERRULE, FERULE. |
| FIBRILLINS | • fibrillins n. Plural of fibrillin. • FIBRILLIN n. a protein found in connective tissue. |
| FLATLINERS | • flatliners n. Plural of flatliner. • FLATLINER n. one who flatlines. |
| FLEERINGLY | • fleeringly adv. In a fleering manner; scornfully; with derision. • FLEERING adv. sneering, jeering. |
| FLIRTINGLY | • flirtingly adv. In a flirting manner. • FLIRTINGLY adv. FLIRTING. |
| FRAXINELLA | • fraxinella n. A fragrant herb in the rue family, Dictamnus albus. • FRAXINELLA n. a perennial herb of the rue family. |
| FRIENDLILY | • friendlily adv. (Rare) In a friendly manner; like a friend; warmly; kindly. • FRIENDLY adv. amicable. |
| FRILLINESS | • frilliness n. The quality of being frilly. • FRILLINESS n. the state of being frilly. |
| FRINGILLID | • fringillid n. (Zoology) Any of the Fringillidae; a finch. • FRINGILLID adj. related to the finches. |
| FRIVOLLING | • frivolling v. Present participle of frivol. • FRIVOL v. to behave playfully. |
| INFERNALLY | • infernally adv. In an infernal manner. • INFERNAL adv. pertaining to hell. |
| INFORMALLY | • informally adv. In an irregular or informal manner; without the usual forms. • INFORMAL adv. marked by the absence of formality or ceremony, also UNFORMAL. |
| NULLIFIERS | • nullifiers n. Plural of nullifier. • NULLIFIER n. one who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties. |
| PAINFULLER | • painfuller adj. Comparative form of painful: more painful. • PAINFUL adj. causing pain. |
| REFUELLING | • refuelling v. (British spelling) present participle of refuel. • refuelling n. (British spelling) The provision of more fuel to replace that used up. • REFUELLING n. the act of adding new fuel, also REFUELING. |
| TRIFLINGLY | • triflingly adv. In a trifling manner. • TRIFLING adv. trivial. |