The Collaborative International Dictionary of English v.0.48:

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]