toughened vs treated

toughened and treated both are adjectives.

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

As adjectives, toughened and treated are synonyms defined as:

toughened and treated: made hard or flexible or resilient especially by heat treatment

Other synonyms of toughened include hardened, tempered.

toughened (adjective)	treated (adjective)
physically toughened	subjected to a physical (or chemical) treatment or action or agent
made hard or flexible or resilient especially by heat treatment	given medical care or treatment
	made hard or flexible or resilient especially by heat treatment