(superl.) Full of knots; hard; tough; hence, capable of enduring or resisting much.

arthritic bent bumpy burled contorted crooked distorted gnarly knobbed knobbly knobby knoblike knotted knotty knurled knurly lumpy nodal noded nodiform nodose nodular nodulated noduled nubbled nubbly nubby studded torose tubercular tuberculous tuberose tuberous twisted warped