Definitions:

1. Describes someone or something that is wavering, indecisive, or hesitant. ADJECTIVE
   • Despite his vacillant demeanor, he eventually made a bold decision that surprised everyone.
2. Refers to a lack of firmness or resolution in making decisions or taking actions. ADJECTIVE
   • Her vacillant nature made it difficult for her to choose a career path.
3. Uncertain in purpose or action. ADJECTIVE
   • He appeared vacillant, unable to commit to any particular plan.

Synonyms:

• doubting
• faltering
• hesitant
• indecisive
• vacillating
• wavering