One who shilly-shallies; an irresolute person.(noun)
The Century Dictionary (Public Domain)
Use "shilly-shallier" in a sentence
"O'Connor, you may recall, was nominated to fill a vacancy left by Potter Stewart no relation to this blogger, a conservative shilly-shallier who first voted against the right to privacy and then changed his mind to vote for Roe and against the censorship of pornography."