outdated vs superannuated

outdated and superannuated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
outdated	No	Yes	No	No
superannuated	No	Yes	No	No

As adjectives, outdated and superannuated are synonyms defined as:

Other synonyms of outdated include obsolete, out-of-date.

outdated (adjective)	superannuated (adjective)
old; no longer valid or fashionable	old; no longer valid or fashionable
	too old to be useful