This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Out-of-date; old-fashioned.

adj. Out of date, old-fashioned, antiquated.

adj. Out of date; not the latest one.

adj. Being out of date; antiquated; outmoded; unfashionable.

adj. old; no longer valid or fashionable

"You yourself have used the term outdated when referencing less than a forty year period."

noncurrent   

antiquated    outmoded    unfashionable   

outdate   

out-of-date    outmoded    obsolete    archaic    understaffed    cumbersome    unscientific    up-to-date    mislead    unorthodox