1. [ adjective ] making great mental demands; hard to comprehend or solve
Synonyms: baffling problematical problematic

"a baffling problem" "I faced the knotty problem of what to have for breakfast" "a problematic situation at home"

Related terms: difficult
2. [ adjective ] used of old persons or old trees; covered with knobs or knots
Synonyms: gnarly knotted knobbed gnarled

"gnarled and knotted hands" "a knobbed stick"

Related terms: crooked
3. [ adjective ] highly involved or intricate
Synonyms: intricate tortuous tangled involved labyrinthine convoluted Byzantine

"the Byzantine tax structure" "convoluted reasoning" "intricate needlework" "the plot was too involved" "a knotty problem" "labyrinthine maneuvering" "Oh, what a tangled web we weave"- Sir Walter Scott

Related terms: complex
Similar spelling:   Knott