Not in current fashion: unfashionable attire. (adjective)
Not socially approved: an unfashionable part of town. (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 "unfashionable" in a sentence
"18To put it in unfashionable terminology: the elite household endowed these noblewomen with agency."
"The director of lobby group, Tasmanians United Against Norman Baker, today called for all Tasmanians to boycott Baker’s electorate of Lewes, in unfashionable East Sussex."
"But the unfashionable are always the majority, and they are not unfashionable because they choose to be."