thickened vs callous

thickened and callous both are adjectives.

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

As adjectives, thickened and callous are synonyms defined as:

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

Other synonyms of thickened include calloused.

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

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