knot·ty 
(nŏtē)
(nŏtē)adj. knot·ti·er, knot·ti·est
1. Tied or snarled in knots.
2. Covered with knots or knobs; gnarled.
3. Difficult to understand or solve: "[The columnist] supplies funny, wise responses to knotty ethical dilemmas posed by readers" (David Pogue).
knotti·ness n.
- circuit rider
- circuitry
- circuit training
- circuity
- circular
- circular file
- circular function
- circularity
- circularization
- circularize
- circularizer
- circularly
- circular measure
- circular mil
- circular saw
- circulate
- circulating library
- circulation
- circulative
- circulator
- circulatory
- circulatory system
- circum-
- circumambience
- circumambiency