flaccid \flac"cid\ (fl[a^]k"s[i^]d or fl[a^]s"s[i^]d), a. [L. flaccidus, fr. flaccus flabby: cf. OF. flaccide.] Yielding to pressure for want of firmness and stiffness; soft and weak; limber; lax; drooping; flabby; as, a flaccid muscle; flaccid flesh. [1913 Webster] Religious profession . . . has become flacced. --I. Taylor. -- {flac"cid*ly} (fl[a^]k"s[i^]d*l[y^] or fl[a^]s"s[i^]d*l[y^]), adv. -- {flac"cid*ness}, n. [1913 Webster]