ruggedness是什么意思？

A rugged area of land is uneven and covered with rocks, with few trees or plants.

If you describe a man as rugged, you mean that he has strong, masculine features.

If you describe someone's character as rugged, you mean that they are strong and determined, and have the ability to cope with difficult situations.

A rugged piece of equipment is strong and is designed to last a long time, even if it is treated roughly.