many-sided vs multilateral

many-sided and multilateral both are adjectives.

Word	Noun	Adjective	Verb	Adverb
many-sided	No	Yes	No	No
multilateral	No	Yes	No	No

As adjectives, many-sided and multilateral are synonyms defined as:

many-sided (adjective)	multilateral (adjective)
having many parts or sides	having many parts or sides
full of variety or interest
having many aspects or qualities