knot·ty 
/ˈnɑ:ti/ adjective
knot·ti·er; knot·ti·est /ˈnɑ:ti/ adjective 1 of wood : having many dark round marks showing where branches grew : having many knots
▪ knotty wood ▪ knotty paneling ▪ knotty pine 2 : difficult or complicated
▪ a knotty problem/situation
▪ knotty wood ▪ knotty paneling ▪ knotty pine
▪ a knotty problem/situation
