Антонимом an unheard of

conventional ordinary orthodox regular ceremonial ceremonious formal normal routine typical usual proper common standard

frequent regular habitual ceaseless chronic consistent constant customary common continual continuing continuous countless daily endless enduring eternal everyday general incessant ineradicable interminable iterated lasting lifelong lingering neverending perennial periodic periodical permanent perpetual persistent persisting profuse prolonged quotidian rampant recurrent recurring reiterated reiterative relentless repeated routine sempiternal standard steady successive sustained unabating unending uninterrupted unrelenting unrelieved unremitting usual wonted day-to-day long-lasting never-ending non-stop

ordinary tiny believable common credible expected inferior normal plain plausible regular simple unamazing usual

unoriginal

famous celebrated distinguished renowned acclaimed famed recognised recognized notable noted prominent eminent known esteemed reputable illustrious legendary honored honoured popular respected big-name familiar infamous much-publicized notorious pre-eminent well-known much publicized well known

close familiar near

familiar hackneyed old time-honored tired warmed-over known unsurprising usual predictable comfortable customary well-known expected foreseen recognizable tried recognisable anticipated foreseeable tried-and-true accustomed predicted

run-of-the-mill unremarkable

an unreasonable amount of an unspecified anuptaphobia anuria anvil chorus anxieties a number of A number 1 a number a nuisance antwacky antsy