(adv.) In a scowling manner.

adamantly appallingly austerely banefully bleakly decorously demurely direly dismally dourly dreadfully drearily earnestly firmly formally frowningly funereally gloomily gloweringly glumly gravely grumly harshly heavily hideously horribly horridly immovably immutably implacably inclemently inexorably inflexibly intransigently irreconcilably loweringly moodily mopingly morosely mumpishly obdurately relentlessly rigidly rigorously roughly ruggedly sadly scowlingly sedately seriously severely shockingly sober-mindedly soberly sobersidedly solemnly somberly sombrously staidly sternly stiffly strictly stringently sulkily sullenly surlily terribly thoughtfully toughly tragically unalterably unbendingly unchangeably uncompromisingly unregenerately unrelentingly unsparingly unyieldingly