rugged vs toughened

rugged and toughened both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rugged	No	Yes	No	No
toughened	No	Yes	No	No

rugged (adjective)	toughened (adjective)
sturdy and strong in constitution or construction; enduring	physically toughened
having long narrow shallow depressions (as grooves or wrinkles) in the surface	made hard or flexible or resilient especially by heat treatment
very difficult; severely testing stamina or resolution
topographically very uneven