old-hat vs banal

old-hat and banal both are adjectives.

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

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

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

old-hat (adjective)	banal (adjective)
out of fashion	repeated too often; overfamiliar through overuse
repeated too often; overfamiliar through overuse