What do the dots mean for impeccable in the dictionary word entry? im•pec•ca•ble (im-ˈpek-ə-bəl) adj. 1: having no flaws; perfect. 2: incapable of wrongdoing. [latin impeccabilis: in-, not; see in-1 + peccare, to sin.] a. they indicate the original language. b. they separate the root and prefix. c. they separate the syllables. d. they represent the accents.