not decided or determined.
not having one's mind firmly made up.


a person who is undecided: Are you still among the undecideds?

Origin of undecided

First recorded in 1530–40; un-1 + decided
Related formsun·de·cid·ed·ly, adverbun·de·cid·ed·ness, noun

Synonyms for undecided

2. indecisive, fluctuating, wavering, vacillating; irresolute.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for undecided

Contemporary Examples of undecided

Historical Examples of undecided

  • Then he stopped, undecided, and looked back over his shoulder.

    White Fang

    Jack London

  • Steenie stood smiling and undecided on the slab in front of the doorstep.

    Heather and Snow

    George MacDonald

  • I don't think I was ever so undecided about anything in my life.

  • I am often undecided, Parmenides, as to whether I ought to include them or not.

  • Beltrame paused, and looked from Valentina to Gonzaga, undecided.


    Raphael Sabatini

British Dictionary definitions for undecided



not having made up one's mind
(of an issue, problem, etc) not agreed or decided upon
Derived Formsundecidedly, adverbundecidedness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for undecided

1530s, "not decided, unsettled," from un- (1) "not" + past participle of decide (v.).

Online Etymology Dictionary, © 2010 Douglas Harper