| BEHAVIOURISTIC | • behaviouristic adj. Britain standard spelling of behavioristic. • BEHAVIOURISTIC adj. relating to behaviourism, also BEHAVIORISTIC. |
| CHIVALROUSNESS | • chivalrousness n. The state of being chivalrous. • CHIVALROUS n. gentlemanly, valiant. |
| CLAVICYTHERIUM | • clavicytherium n. (Music) A harpsichord in which the soundboard and strings are mounted vertically facing the player. • CLAVICYTHERIUM n. a harpsichord-like musical instrument. |
| EXHAUSTIVENESS | • exhaustiveness n. The state of being exhaustive. • EXHAUSTIVE n. testing all possibilities or considering all elements. |
| EXHAUSTIVITIES | • exhaustivities n. Plural of exhaustivity. • EXHAUSTIVITY n. the state of being exhaustive. |
| EXTRAVEHICULAR | • extravehicular adj. Relating to, on happening in, the space outside a vehicle, especially a spacecraft in space. • extra-vehicular adj. Alternative spelling of extravehicular. • EXTRAVEHICULAR adj. taking place outside a vehicle (as a spacecraft). |
| INTERBEHAVIOUR | • interbehaviour n. Rare spelling of interbehavior. • INTERBEHAVIOUR n. interaction between multiple individuals, also INTERBEHAVIOR. |
| NONBEHAVIOURAL | • nonbehavioural adj. Alternative spelling of nonbehavioral. • NONBEHAVIOURAL adj. not behavioural, also NONBEHAVIORAL. |
| OUTFANGTHIEVES | • OUTFANGTHIEF n. (historical) the right of judging and fining thieves pursued and brought back from outside one's own jurisdiction. |
| OVERENTHUSIASM | • overenthusiasm n. Excessive enthusiasm. • OVERENTHUSIASM n. an excessive enthusiasm. |
| SUPERACHIEVERS | • superachievers n. Plural of superachiever. • SUPERACHIEVER n. an extreme achiever. |
| UNAPPREHENSIVE | • unapprehensive adj. Not apprehending. • UNAPPREHENSIVE adj. not apprehensive. |
| UNDERACHIEVERS | • underachievers n. Plural of underachiever. • UNDERACHIEVER n. one that fails to attain a predicted level of achievement or does not do as well as expected. |
| UNDERACHIEVING | • underachieving v. Present participle of underachieve. • UNDERACHIEVE v. to achieve less than one's potential. |
| UNVANQUISHABLE | • unvanquishable adj. That cannot be vanquished; undefeatable, inconquerable. • UNVANQUISHABLE adj. not vanquishable. |
| VOUCHSAFEMENTS | • vouchsafements n. Plural of vouchsafement. • VOUCHSAFEMENT n. the act of vouchsafing. |