Synset

harshly uninviting or formidable in manner or appearance
<adj.all>   freq. cnt.: 1 freq. cnt.: 1

dour

forbidding

grim

sample sentences

"a dour, self-sacrificing life"
"a forbidding scowl"
"a grim man loving duty more than humanity"
"undoubtedly the grimmest part of him was his iron claw"- J.M.Barrie