The Oxford Thesaurus An A-Z Dictionary of Synonyms - fearfully adv.

1) hesitantly, timidly, timorously, shyly, diffidently, unwillingly, nervously, edgily, anxiously, apprehensively: Fearfully, she approached the altar. 2) very, awfully, terribly, extremely, exceedingly, frightfully, tremendously: It was fearfully considerate of you to come.