notoriously UK /nə(ʊ)ˈtɔː.ɹɪ.əs.li/US /nəˈtɔ.ɹi.əs.li/ adverb1 •In a notorious or notable manner; as is commonly known.The Hempshocks' sheep were notoriously the finest for miles around: shaggy-coated and intelligent (for sheep), with curling horns and sharp hooves. — 1999 formsmore notoriously · most notoriously