- Having many knots or lumps.
- Having a rough, irregular surface.
Late 16th century: from knob + -ly.
- The knobbly branch was too rough to use as a walking stick.
- The knobbly roots of the tree made it difficult to dig up.
- The knobbly potatoes were difficult to peel.
- The knobbly surface of the rock made it difficult to climb.
- The knobbly texture of the fabric made it uncomfortable to wear.