| BOATBUILDING | • boatbuilding n. The construction of a boat or boats. • BOATBUILDING n. the industry of building boats. | 
| BULLBAITINGS | • bullbaitings n. Plural of bullbaiting. • BULLBAITING n. the former practice of baiting bulls with dogs. | 
| LANDLUBBERLY | • landlubberly adj. Like a landlubber. • LANDLUBBERLY adj. like a landlubber, a seaman's derogatory name for a landsman. | 
| OBNUBILATING | • obnubilating v. Present participle of obnubilate. • OBNUBILATE v. (obsolete) to darken, cloud over. | 
| OBNUBILATION | • obnubilation n. The action of darkening or fact of being darkened, as with a cloud; obscuration. • obnubilation n. (Medicine, specifically) Obscuration or clouding of the mind or faculties. • obnubilation n. (Rare, literally) A veiling with or concealment in clouds. | 
| SUBABDOMINAL | • subabdominal adj. (Anatomy) Beneath the abdomen. • SUBABDOMINAL adj. relating to the lower abdomen. | 
| SUBLIBRARIAN | • sublibrarian n. An under or assistant librarian. • SUBLIBRARIAN n. a subordinate librarian. | 
| UNBELIEVABLE | • unbelievable adj. (Literally) Not to be believed. • unbelievable adj. (Figuratively) Amazing, incredible; so surprising it is almost unable to believe. • unbelievable adj. Implausible or improbable. | 
| UNBELIEVABLY | • unbelievably adv. (Manner) In a manner that one does not or cannot believe. • unbelievably adv. (Degree) To an extent not to be believed. • unbelievably adv. (Evaluative) Contrary to expectations, amazingly. | 
| UNBETTERABLE | • unbetterable adj. That cannot be bettered. • UNBETTERABLE adj. that cannot be bettered. | 
| UNBREACHABLE | • unbreachable adj. Impossible to breach. • UNBREACHABLE adj. that cannot be breached. | 
| UNBREAKABLES | • unbreakables n. Plural of unbreakable. | 
| UNBREATHABLE | • unbreathable adj. Not suitable for breathing. • unbreathable adj. Not letting air seep through. • UNBREATHABLE adj. not fit for being breathed. | 
| UNBRIDGEABLE | • unbridgeable adj. Unable to be bridged or crossed; impossible to span. • UNBRIDGEABLE adj. that cannot be bridged. | 
| UNOBSERVABLE | • unobservable adj. That cannot be observed. • unobservable n. Something that cannot be observed. • UNOBSERVABLE n. something that cannot be observed. | 
| UNOBTAINABLE | • unobtainable adj. Unable to be obtained: not able to be acquired or reached. • unobtainable n. Someone or something that cannot be obtained. • UNOBTAINABLE adj. not obtainable. |