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WordNet (r) 3.0 (2006) (WordNet)

knotty
adj 1: making great mental demands; hard to comprehend or solve
or believe; "a baffling problem"; "I faced the knotty
problem of what to have for breakfast"; "a problematic
situation at home" [synonym: {baffling}, {elusive}, {knotty},
{problematic}, {problematical}, {tough}]
2: used of old persons or old trees; covered with knobs or
knots; "gnarled and knotted hands"; "a knobbed stick" [synonym:
{gnarled}, {gnarly}, {knotted}, {knotty}, {knobbed}]
3: highly complex or intricate and occasionally devious; "the
Byzantine tax structure"; "Byzantine methods for holding on
to his chairmanship"; "convoluted legal language";
"convoluted reasoning"; "the plot was too involved"; "a
knotty problem"; "got his way by labyrinthine maneuvering";
"Oh, what a tangled web we weave"- Sir Walter Scott;
"tortuous legal procedures"; "tortuous negotiations lasting
for months" [synonym: {Byzantine}, {convoluted}, {involved},
{knotty}, {tangled}, {tortuous}]
4: tangled in knots or snarls; "a mass of knotted string";
"snarled thread" [synonym: {knotty}, {snarled}, {snarly}]