Synonyms of vacillate

vacillate

verb

ˈva-sə-ˌlāt 

as in to hesitate

to show uncertainty about the right course of action

vacillated for so long that someone else stepped in and made the decision

Synonyms & Similar Words

• hesitate
• falter
• waver
• dither
• debate
• scruple
• stagger
• wait
• hang back
• halt
• teeter
• pause
• balance
• sway
• shilly-shally
• wobble
• linger
• ponder
• procrastinate
• haw
• dawdle
• delay
• weigh
• oscillate
• equivocate
• deliberate
• hem
• chicken (out)
• back down
• consider
• waffle
• hedge
• pussyfoot
• dally

Antonyms & Near Antonyms

• decide
• continue
• stir
• plunge (in)
• dive (in)
• advance
• budge

Synonym Chooser

How does the verb vacillate differ from other similar words?

Some common synonyms of vacillate are falter, hesitate, and waver. While all these words mean "to show irresolution or uncertainty," vacillate implies prolonged hesitation from inability to reach a firm decision.

vacillated until events were out of control

When is it sensible to use falter instead of vacillate?

While the synonyms falter and vacillate are close in meaning, falter implies a wavering or stumbling and often connotes nervousness, lack of courage, or outright fear.

never once faltered during her testimony

When would hesitate be a good substitute for vacillate?

The words hesitate and vacillate are synonyms, but do differ in nuance. Specifically, hesitate implies a pause before deciding or acting or choosing.

hesitated before answering the question

When could waver be used to replace vacillate?

Although the words waver and vacillate have much in common, waver implies hesitation after seeming to decide and so connotes weakness or a retreat.

wavered in his support of the rebels

Example Sentences

Recent Examples of vacillate

Trump has been more active than ever on social media in his second term, including posting lengthy all-caps screeds offering vacillating updates on the war. —Alexander Smith, NBC news, 30 Mar. 2026

Trump has vacillated between indifference and contempt for the USMCA, at times threatening to pull out of the agreement altogether and work instead to negotiate two separate, bilateral deals with Mexico and Canada. —Kate Nishimura, Sourcing Journal, 18 Mar. 2026

Watch a season of the Y2K reality juggernaut and the tone will vacillate wildly between cringe-worthy put-downs via Janice Dickinson, cringier photoshoots, feel-good runway lessons with Miss J, and body positivity monologues from Tyra Banks. —Madeline Hirsch, InStyle, 17 Feb. 2026

This hesitation was not the result of vacillating between options in indecision, but an active and regulated brain process to pause before acting due to environmental uncertainty. —Eric Yttri, The Conversation, 12 Feb. 2026