go unnoticed(For some years this work went largely unnoticed in the West, until after the Second World War it was discovered by a new generation of librarians. ESD Alexander Demidov)
discreetly(Hi Carol, if you see something like this again that you would like to discreetly report, you can text Transit Police at 87-77-77 when it is happening. ART Vancouver)
go entirely unnoticed(that the extinction event, which was accompanied by a severe bout of global warming, went entirely unnoticed by sea-floor inhabitants. Alexander Demidov)
discreet(Millionaires like to be discreet. -- Миллионеры стремятся не привлекать к себе излишнего внимания.
• Most wealthy people try to be discreet with their money.ART Vancouver)