Definition of vacillator in English:

vacillator

Pronunciation /-ˌlātər/

noun

See vacillate

‘He said the scrutiny of history was indeed a very cold, harsh and objective spotlight that in time will reveal all vacillators to be men of talk but not action.’
  • ‘He mocked his challenger as a vacillator who could spend the whole time debating himself.’
  • ‘They view him as a vacillator whose tactical shifts in the face of foreign pressure have been unpardonable.’