forbiddingly
Adverb
Meaning
in an unpleasant or menacing manner
Source: WordNetSynonyms
coolly
sternly
grimly
disagreeably
dismally
horridly
austerely
frigidly
frostily
harshly
threateningly
bleakly
unattractively
gauntly
minatorily
Antonyms
Examples
it was forbiddingly dark in the corridor