Superlative form of knotty: most knotty.(adjective)
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Use "knottiest" in a sentence
"Now he had arrived at one of the "knottiest" points of the whole performance."
"And as for Jamie Elkins, part of the Common Cents Consulting team, we could not have worked our way out of some of the knottiest compliance and accounting issues without her."
"One key to solving the knottiest problem of the debt ceiling could prove to be an idea that Mr. McConnell himself hatched a few weeks ago."