Adjective
1. making great mental demands; hard to comprehend or solve;
"a baffling problem""I faced the knotty problem of what to have for breakfast""a problematic situation at home"2. used of old persons or old trees; covered with knobs or knots;
"gnarled and knotted hands""a knobbed stick"3. highly involved or intricate;
"the Byzantine tax structure""convoluted legal language""convoluted reasoning""intricate needlework""an intricate labyrinth of refined phraseology""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"