Knobby (adjective)

Having many knobs or protuberances; bumpy or irregular in shape.

Origin:

From the word knob, which means a small rounded protuberance, a rounded lump or a protuberant part.

Examples:

1. The knobby texture of the bark made it easy for the climbers to grip.
2. The knobby potato had many small protuberances on its skin.
3. The knobby surface of the rock made it difficult to climb.
4. The knobby root made it hard to dig up.
5. The knobby tree had many small bumps on its trunk.