Simple past tense and past participle of unknot.(verb)
Not knotted.(adjective)
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Use "unknotted" in a sentence
"I just don't trust my knots with braid, and besides, when fishing combat areas, other fisherman hate people who use braid because of the pain of getting unknotted."
"That connection has only about 70 percent of unknotted line strength, but the pound-tests I'm using are high enough so I don't think that makes much difference."
"The results below, averaged over 10 tests per knot, list what percentage of that unknotted breaking strength the various knots broke at."