unlettered vs unlearned

unlettered and unlearned both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unlettered	No	Yes	No	No
unlearned	No	Yes	No	No

As adjectives, unlettered and unlearned are synonyms defined as:

unlettered and unlearned: uneducated in general; lacking knowledge or sophistication

Other synonyms of unlettered include ignorant, nescient.

unlettered (adjective)	unlearned (adjective)
having little acquaintance with writing	not established by conditioning or learning
uneducated in general; lacking knowledge or sophistication	uneducated in general; lacking knowledge or sophistication
	not well learned