treated vs toughened

treated and toughened both are adjectives.

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

As adjectives, treated and toughened are synonyms defined as:

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

Other synonyms of treated include hardened, tempered.

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