un•put•down•a•ble Pronunciation: (un”poot-dou’nu-bul), [key] —adj. Informal. Adjective meaning consistently and irresistibly interesting. Typically refers to a book that is so well written and entertaining as to be difficult to (literally) put down and pause away from. Normally a term used to describe novels, but the vSphere Quick Start Guide certainly fits the definition. Last month [...]