Monstrously

(adv.) In a monstrous manner; unnaturally; extraordinarily; as, monstrously wicked.

Thesaurus Entries

abjectly, abominably, arrantly, atrociously, basely, contemptibly, despicably, eerily, execrably, fancifully, fantastically, flagrantly, foully, grossly, grotesquely, heinously, meanly, miserably, mysteriously, nefariously, obnoxiously, odiously, outlandishly, peculiarly, pettily, poorly, quaintly, queerly, scurvily, shabbily, shoddily, singularly, strangely, supernaturally, vilely, wretchedly