Not in fashion; unfashionable: outmoded attire; outmoded ideas. (adjective)
No longer usable or practical; obsolete: outmoded machinery. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "outmoded" in a sentence
"Why do these theories of good study habits that are in outmoded persist?"
"We are trying to do more and better research with less support staff, in outmoded laboratories and depleted libraries."
"Insisting that people should say data are, in spite of the fact that an American English speaker can’t use data are without sounding pretentious or outmoded, is stupid."