grimly (adv.)

• adamantly
• appallingly
• austerely
• banefully
• bleakly
• decorously
• demurely
• dismally
• dourly
• dreadfully
• drearily
• earnestly
• firmly
• formally
• frowningly
• gloomily
• gloweringly
• glumly
• gravely
• harshly
• heavily
• hideously
• horribly
• horridly
• immovably
• immutably
• inexorably
• inflexibly
• loweringly
• moodily
• morosely
• obdurately
• relentlessly
• rigidly
• rigorously
• roughly
• ruggedly
• sadly
• sedately
• seriously
• severely
• shockingly
• soberly
• solemnly
• somberly
• staidly
• sternly
• stiffly
• strictly
• stringently
• sulkily
• sullenly
• surlily
• terribly
• thoughtfully
• toughly
• tragically
• unalterably
• unchangeably
• uncompromisingly
• unrelentingly
• unsparingly