забота(concern; business; affair; responsibility (usually used in negative constructions) eg "be no nevermind of someone's": It's no nevermind of yourscollinsdictionary.com)
внимание(attention; heed; notice (usually used in negative constructions), eg "pay someone (or something) no nevermind – не обращать на кого-либо/что-либо внимания": Pay him no nevermindcollinsdictionary.com'More)
дело(concern; business; affair; responsibility (usually used in negative constructions) eg "be no nevermind of someone's": It's no nevermind of yourscollinsdictionary.com)