Looks on in wonderment, as kids in playground did?

• Switched backwards and forwards
• Vacillated
• Kept changing one's mind
• Couldn't make up one's mind
• Changed one's mind again and again
• Wasn't steady
• Came down to the playground?
• Wavered back and forth

Wiktionary Word definitions in Wiktionary
vb. (en-past of: seesaw )