He is a temporizer―a time-server―a vacillating man―a waverer―a slow coach.
彼は困循姑息な人だ - 斎藤和英大辞典
He is vacillating―wavering―shilly-shallying―backing and filling―irresolute―undecided―He does not know his own mind.
首鼠両端決するあたわず - 斎藤和英大辞典
He is always vacillating―wavering―backing and filling―undecided―irresolute―He does not know his own mind.
彼は逡巡して決するところ無し - 斎藤和英大辞典
Public expectations focused on the military, and politicians who were accused of vacillating weakness lost their trust.
国民の期待は軍部に集まり、弱腰であると非難されていた政治家は信頼を失った。 - Wikipedia日英京都関連文書対訳コーパス