adj. not in accord with the current fashion, standards or mores of a particular group; not cool
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (spoken slang) unfashionable and boring
Word Usage
"The “slutty flight attendant” line, though certainly uncalled for, seems to me equivalent to the sorts of things that are said about the Clintons and the Kennedys—uncool, that is to say, but roughly commensurate with the price of fame."