Entry 2 senses · 2 variants Webster, 1913 Undone /ən-dŭn'/ · Un·done · IPA /ʌnˈdʌn/ p. p. a. 01 p. p. p. p. of Undo. 1. p. p. of Undo. See: Undo 02 a. Not done or performed; neglected. 1. Not done or performed; neglected.