The Collaborative International Dictionary
Undecisive
Undecisive \Un`de*ci"sive\, a.
Indecisive. [R.]
--Glanvill.
Douglas Harper's Etymology Dictionary
undecisive
1660s, from un- (1) "not" + decisive. The usual word is indecisive.
Wiktionary
undecisive
a. (alternative form of indecisive English)
Usage examples of "undecisive".
A series of bloody and undecisive combats is nothing more than an anticipation of what would have been effected in a few years by the course of nature.