The Collaborative International Dictionary of English v.0.48:
Waverer \Wa"ver*er\, n. One who wavers; one who is unsettled in doctrine, faith, opinion, or the like. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
waverer n 1: one who hesitates (usually out of fear) [syn: waverer, vacillator, hesitator, hesitater]