toughened vs thickened

toughened and thickened both are adjectives.

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

toughened (adjective)	thickened (adjective)
physically toughened	made or having become thick
made hard or flexible or resilient especially by heat treatment	made thick in consistency
	having calluses; having skin made tough and thick through wear