lengthy vs drawn-out

lengthy and drawn-out both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lengthy	No	Yes	No	No
drawn-out	No	Yes	No	No

As adjectives, lengthy and drawn-out are synonyms defined as:

lengthy and drawn-out: relatively long in duration; tediously protracted

Other synonyms of lengthy include extended, prolonged, protracted.

lengthy (adjective)	drawn-out (adjective)
relatively long in duration; tediously protracted	relatively long in duration; tediously protracted
	(used of speech) uttered slowly with prolonged vowels