பொருள் : The quality of being topologically uneven.
							எடுத்துக்காட்டு : 
							The ruggedness of the mountains.
							
பொருள் : The quality of being difficult to do.
							எடுத்துக்காட்டு : 
							He assigned a series of problems of increasing hardness.
							The ruggedness of his exams caused half the class to fail.
							
ஒத்த சொற்கள் : hardness