What does vacillatory mean?
Vacillatory means wavering, indecisive, or prone to change one's course. The word is often used for decisions, policies, attitudes, and negotiations that repeatedly shift without firm commitment: a government may pursue a vacillatory policy, or a committee may display a vacillatory approach. It can also describe physical movement that is unsteady or repeatedly reverses direction. Although clearly understandable, vacillatory is more formal and less common than wavering or indecisive, and its slightly technical tone suits legal, political, academic, or analytical writing. The word ultimately comes from Latin vacillare, meaning to waver, lean, or totter. Its emphasis is not simply on temporary uncertainty but on a persistent tendency to hesitate, reverse course, or fail to settle on a stable course of action.
adjectiveWavering or indecisive; tending to change one's course, opinion, or intention. It may also describe something characterized by such irregular movement or fluctuation.
- Wavering, indecisive, or given to changing direction, opinion, or intention.
"The committee's vacillatory response left the proposal in limbo for months."
"After several vacillatory decisions, the negotiator finally proposed a concrete plan."
"The vacillatory movement of the pendulum made it difficult to take a precise reading."
Vacillatory reaches back to Latin vacillare, a word for leaning, tottering, or wavering—an apt image for opinions that cannot remain steady.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does vacillatory come from?
Vacillatory was formed in English from Latin vacillatorius, an adjective derived from vacillare, meaning to waver, lean, or totter. The same Latin root also produced the familiar verb vacillate and the noun vacillation. English developed these forms from the early modern period, with vacillatory retaining the more formal character of a learned Latin-derived adjective.
Related word forms
How vacillatory is actually used
This is a formal and relatively uncommon word. It is especially associated with wavering decisions, policies, or attitudes, but it can also describe unsteady or fluctuating movement.
Easily confused with vacillatory
Vacillatory is an adjective describing something that tends to waver, whereas vacillate is a verb describing the act of wavering.