callous vs thickened

callous and thickened both are adjectives.

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

As adjectives, callous and thickened are synonyms defined as:

callous and thickened: having calluses; having skin made tough and thick through wear

Other synonyms of callous include calloused.

callous (adjective)	thickened (adjective)
emotionally hardened	made or having become thick
having calluses; having skin made tough and thick through wear	made thick in consistency
	having calluses; having skin made tough and thick through wear

callous (verb)	thickened (verb)
make insensitive or callous; deaden feelings or morals