| adjective | making great mental demands; hard to comprehend or solve or believe “a baffling problem” |
| adjective | used of old persons or old trees; covered with knobs or knots “gnarled and knotted hands” |
| adjective | highly complex or intricate and occasionally devious; ; ; ; ; ; ; ; - Sir Walter Scott “the Byzantine tax structure” |
| adjective | tangled in knots or snarls “a mass of knotted string” |
| knottiness | noun | puzzling complexity |
| problem | noun | a state of difficulty that needs to be resolved |
| toughness | noun | impressive difficulty |
| gnarl | noun | something twisted and tight and swollen |
| tortuousness | noun | puzzling complexity |
| knot | noun | something twisted and tight and swollen |
| snarl | noun | something jumbled or confused |