different between undecided vs undecisive

English

From Middle English undecided, equivalent to un- +? decided.

undecided (comparative more undecided, superlative most undecided)

Open and not yet settled or determined.
The question of man's destiny is still undecided.
Uncommitted, not having reached a decision.
The result of the election is in doubt because of a large number of undecided voters.

(open and not yet settled): indeterminate, unsettled, indecisive
(uncommitted; not having reached a decision): ambivalent, irresolute, of two minds, indecisive

undecided (plural undecideds)

undecided

un- +? decisive

undecisive (comparative more undecisive, superlative most undecisive)

Alternative form of indecisive
- 1665, Joseph Glanvill, Scepsis Scientifica
  this Philosophy is litigious, the very spawn of disputations and controversies as undecisive as needless

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