lonely vs alone

lonely and alone both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lonely	No	Yes	No	No
alone	No	Yes	No	Yes

As adjectives, lonely and alone are synonyms defined as:

Other synonyms of lonely include lone, solitary.

lonely (adjective)	alone (adjective)
marked by dejection from being alone	exclusive of anyone or anything else
lacking companions or companionship	radically distinctive and without equal
devoid of creatures	lacking companions or companionship
characterized by or preferring solitude	isolated from others

lonely (adverb)	alone (adverb)
	without any others being included or involved
	without anybody else or anything else