Webster's English Dictionary

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nefarious

Cross references:
  1. vicious               
 
ne.far.i.ous \ni-'far-e--*s, -'fer-\ aj [L nefarius, fr. nefas crime, fr. 
   ne- not + fas right,]divine law; akin to L fari to speak : flagrantly 
   wicked or impious : EVIL  - ne.far.i.ous.ly av