undecide

From un- +‎ decide.

undecide (third-person singular simple present undecides, present participle undeciding, simple past and past participle undecided)

1. (transitive) To reverse or go back on (a previous decision).

• “undecide”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• deinduce