threadbare vs old-hat

threadbare and old-hat both are adjectives.

Word	Noun	Adjective	Verb	Adverb
threadbare	No	Yes	No	No
old-hat	No	Yes	No	No

As adjectives, threadbare and old-hat are synonyms defined as:

threadbare and old-hat: repeated too often; overfamiliar through overuse

Other synonyms of threadbare include banal, commonplace, hackneyed, shopworn, stock, timeworn, tired, trite, well-worn.

threadbare (adjective)	old-hat (adjective)
repeated too often; overfamiliar through overuse	out of fashion
having the nap worn away so that the threads show through	repeated too often; overfamiliar through overuse