| NUBIGENOUS | • nubigenous adj. Born of, or produced from, clouds. • NUBIGENOUS adj. cloud-born. |
| NUMBNUTSES | • numbnutses n. Plural of numbnuts. • NUMBNUTS n. an idiot. |
| UBIQUINONE | • ubiquinone n. (Organic chemistry) any of several isoprenyl quinones that have a role in cellular respiration. • UBIQUINONE n. a quinine used involved in the transfer of electrons during cell respiration. |
| UNBOUNCIER | • UNBOUNCY adj. not bouncy. |
| UNBUNDLERS | • unbundlers n. Plural of unbundler. • UNBUNDLER n. one who unbundles. |
| UNBURDENED | • unburdened v. Simple past tense and past participle of unburden. • unburdened adj. Not burdened; without a burden. • UNBURDEN v. to free from a burden, also UNBURTHEN. |
| UNBURNABLE | • unburnable adj. That is difficult or impossible to burn. • UNBURNABLE adj. that cannot be burned. |
| UNBURTHENS | • unburthens v. Third-person singular simple present indicative form of unburthen. • UNBURTHEN v. (archaic) to unburden; to unload. |
| UNBUTTONED | • unbuttoned v. Simple past tense and past participle of unbutton. • unbuttoned adj. Having the buttons undone. • unbuttoned adj. In disarray. (Can we add an example for this sense?) |
| UNDERBURNT | • underburnt v. Simple past tense and past participle of underburn. • UNDERBURNT adj. insufficiently burnt. |
| UNNUMBERED | • unnumbered adj. Not identified with a number. • unnumbered adj. Too numerous to be counted; countless or innumerable. • UNNUMBERED adj. uncounted, innumerable. |
| UNTUNEABLE | • untuneable adj. Alternative form of untunable. • UNTUNEABLE adj. that cannot be tuned, also UNTUNABLE. |
| UNTURNABLE | • unturnable adj. Not turnable. • UNTURNABLE adj. that cannot be turned. |