Source : Webster's Revised Unabridged Dictionary (1913)

Luxuriantly \Lux*u"ri*ant*ly\, adv.
   In a luxuriant manner.

Source : WordNet®

luxuriantly
     adv 1: in an abundant and luxuriant manner; "whiskers grew
            luxuriantly from his ample jowls"
     2: in an elegantly luxuriant way; "this suave, culture-loving
        and luxuriantly good-looking M.P.represents the
        car-workers of Coventry"