on_the_fence
1. [ adjective ] characterized by indecision
Synonyms: undecided
Examples:

"some who had been on the fence came out in favor of the plan" "too many voters still declare they are undecided"

Related terms: indecisive
Similar spelling:   on_the_fly
  on_the_far_side
  on_the_button
  on_the_average
  on_the_books