untied

From un- +‎ tied.

untied (not comparable)

1. Not tied; undone
   • 1921 June, Margery Williams, “The Velveteen Rabbit: Or How Toys Become Real”, in Harper’s Bazar, volume LVI, number 6 (2504 overall), New York, N.Y.: International Magazine Company, →ISSN, →OCLC:

     The sack had been left untied, and so by wriggling a bit he was able to get his head through the opening and look out.

From untie +‎ -ed.

untied

1. simple past and past participle of untie

• United, dunite, unedit, united