Knobbly (adjective)

1. Having many knots or lumps.
2. Having a rough, irregular surface.

Origin:

Late 16th century: from knob + -ly.

Examples:

1. The knobbly branch was too rough to use as a walking stick.
2. The knobbly roots of the tree made it difficult to dig up.
3. The knobbly potatoes were difficult to peel.
4. The knobbly surface of the rock made it difficult to climb.
5. The knobbly texture of the fabric made it uncomfortable to wear.