The Collaborative International Dictionary
old-hat \old-hat\ pred. adj. same as old-fashioned, a., 2. [Narrower terms: unfashionable (vs. fashionable)]
Syn: antique, old-fashioned, outmoded, out-of-date, passe, passee.
Wiktionary
a. See old hat.
WordNet
adj. repeated too often; overfamiliar through overuse; "bromidic sermons"; "his remarks were trite and commonplace"; "hackneyed phrases"; "a stock answer"; "repeating threadbare jokes"; "parroting some timeworn axiom"; "the trite metaphor `hard as nails'" [syn: banal, commonplace, hackneyed, shopworn, stock(a), threadbare, timeworn, tired, trite, well-worn]
out of fashion; "a suit of rather antique appearance"; "demode (or outmoded) attire"; "outmoded ideas" [syn: antique, demode, ex, old-fashioned, old-hat(p), outmoded, passe, passee]