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Infamous by way of being extremely wicked.

[Latin nefārius, from nefās, crime, transgression : ne-, not; see ne in Indo-European roots + fās, divine law; see dhē- in Indo-European roots.]

ne·far′i·ous·ly adv.
ne·far′i·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.nefariously - in a nefarious manner or to a nefarious degree; "nefariously involved in a conspiracy"
References in periodicals archive ?
Frustrated by the state of affairs, the Minister recently illustrated the lengths rogue officials in the department have gone to nefariously embezzle funds.
It is a powerful, dominant, molding attitude that is nefariously manifested when demeaning and distressing representations of any woman, especially when clearly identified, are disguised as jokes," Leonen said.
He added that LGBTQ people have often been used as a distraction from the country's real problems, and "this ban seems to be nefariously timed to coincide with the ongoing and deeply unpopular austerity measures this government is imposing," referring to the draft 2019 budget Cabinet endorsed hours earlier.
He also accused the APC government of destroying the nation's democratic institutions, saying: 'Rather than give teeth to governance and address biting national issues of concern like the insecurity, this government exerts all its energies and resources planning nefariously how to undermine democratic institutions.
During a meeting of the Indian Cabinet Committee on Security, three Indian intelligence service chiefs nefariously plotted plans of multiple strikes vis-a-vis Pakistan, and eagerly awaited a 'political nod' which was duly issued by an increasingly desperate PM Modi as a knee-jerk act of aggressive electioneering where exploiting prejudice and paranoia is the BJP's seminal political plank.
More nefariously, criminalization of marijuana was a tool in the toolboxes of Southwestern lawmen who needed an excuse to detain Mexicans crossing the border.
Brandt's -- a hot-air balloon is involved, for some reason -- and "Ruben Brandt, Collector" begins to center on a grand plot to cure his obsession with certain works of art by indulging it completely and nefariously.
The digital universe makes it appear that everything is available, and the absences are nefariously hidden.
Summary: Kanpur (Uttar Pradesh) [India], Jan 27 (ANI): Rashtriya Swayamsevak Sangh (RSS) chief Mohan Bhagwat against brewed a controversy by claiming that anti-national forces are nefariously working towards destroying peace and virtues in India.
But think back: a decade or two ago could you imagine a computer guiding you home, telling you how to avoid traffic, talking to you the whole way, and getting the journey time pretty much spot on?Of course, humans have their dark side too, and somewhere along the line some corruption occurs and the data often gets used nefariously as well.
And third, for all the times the language of human rights has been nefariously used, have there not also been occasions when it has been vindicated?