The Collaborative International Dictionary of English v.0.48:
Righteously \Right"eous*ly\, adv. [AS. rightw[imac]sl[imac]ce.] In a righteous manner; as, to judge righteously. [1913 Webster]WordNet (r) 3.0 (2006):
righteously adv 1: in a righteous manner; "righteously indignant" [ant: unrighteously]