1530s, "not decided, unsettled," from un- (1) "not" + past participle of decide (v.).
too many voters still declare they are undecided
our position on this bill is still undecided
undecided voters
undaunting
undead
undeceive
undeceived
undecennial
undecided
undecipherable
undecisive
undefeated
undefended
undefiled
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