| THEFTUOUSLY | • theftuously adv. By theft; thievishly. • THEFTUOUS adv. thievish. |
| THYSANUROUS | • thysanurous adj. (Zoology) Of or pertaining to the Thysanura (now Zygentoma), an order of insects with three long caudal filaments. • THYSANUROUS adj. relating to a thysanuran, a bristletail. |
| YOUTHQUAKES | • youthquakes n. Plural of youthquake. • YOUTHQUAKE n. a shift in cultural norms influenced by the values, tastes, and mores of young people. |
| EURYTHERMOUS | • eurythermous adj. Synonym of eurythermal. • EURYTHERMOUS adj. tolerating a wide range of temperature, also EURYTHERMAL, EURYTHERMIC. |
| POSTHUMOUSLY | • posthumously adv. After death. • post-humously adv. Alternative spelling of posthumously. • POSTHUMOUS adv. taking place after death. |
| THUNDEROUSLY | • thunderously adv. In a thunderous manner, very loudly. • THUNDEROUS adv. sounding like thunder, also THUNDROUS. |
| YOUTHFULNESS | • youthfulness n. The vitality characteristic of youth. • YOUTHFULNESS n. the state of being youthful. |
| HYPERCAUTIOUS | • hypercautious adj. Especially or unreasonably cautious. • HYPERCAUTIOUS adj. excessively cautious. |
| ICHTHYOSAURUS | • ichthyosaurus n. (Archaic) Alternative form of ichthyosaur. • ichthyosaurus n. Any members of the genus Ichthyosaurus. • Ichthyosaurus prop.n. A taxonomic genus within the family Ichthyosauridae – large, extinct marine reptiles. |
| UNRIGHTEOUSLY | • unrighteously adv. In an unrighteous manner. • UNRIGHTEOUS adv. not righteous. |
| UNTRUSTWORTHY | • untrustworthy adj. Not deserving of trust; unreliable. • UNTRUSTWORTHY adj. not trustworthy. |
| UPRIGHTEOUSLY | • uprighteously adv. In an uprighteous or just manner. • UPRIGHTEOUSLY adv. (Shakespeare) with moral right. |
| SLAUGHTEROUSLY | • slaughterously adv. In a slaughterous fashion. • SLAUGHTEROUS adv. of or relating to slaughter. |
| YOUTHFULNESSES | • youthfulnesses n. Plural of youthfulness. • YOUTHFULNESS n. the state of being youthful. |
| AUTOCHTHONOUSLY | • autochthonously adv. In an autochthonous manner. • AUTOCHTHONOUS adv. indigenous, aboriginal, also AUTOCHTHONAL, AUTOCHTHONIC. |
| ICHTHYOSAURUSES | • ICHTHYOSAURUS n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURIAN. |
| UNTRUSTWORTHILY | • untrustworthily adv. In an untrustworthy manner. • UNTRUSTWORTHY adv. not trustworthy. |