adjective

Very bad or unpleasant.

the place smelled awful

very unpleasant,disgusting,nasty,terrible,dreadful,ghastly,horrid,horrible,vile,foul,abominable,appalling,atrocious,horrendous,hideous,offensive,objectionable,obnoxious,frightful,loathsome,revolting,repulsive,repellent,repugnant,odious,sickening,nauseating,nauseous

adverb

Awfully; very.

very,extremely,really,exceedingly,immensely,thoroughly,decidedly,terribly,frightfully,dreadfully,fearfully,exceptionally,uncommonly,remarkably,eminently,extraordinarily,most,positively,particularly