1. [adj]  not done; "the work could be done or undone and nobody cared"
2. [adj]  thrown into a state of disorganization or incoherence; "price programs became unstuck because little grain was available"
3. [adj]  not fastened or tied or secured; "her blouse had come undone at the neck"; "his shoelaces were undone"
4. [adj]  doomed to extinction

UNDONE is a 6 letter word that starts with U.

1. \Un*done"\,
   p. p. of {Undo}.
   
   

2. \Un*done"\, a. [Pref. un- not + done.]
   Not done or performed; neglected.