Balefully

['beilfuli]

(adv.) in a baleful manner; 'she looked at him balefully'.

Checked by Alissa--From WordNet

(adv.) In a baleful manner; perniciously.

Checker: Stan

What is that ghastly face looking out balefully after him from behind the arras? William Makepeace Thackeray. Vanity Fair.

Checker: Stan