direful

1. causing fear or dread or terror;

"the awful war"

"an awful risk"

"dire news"

"a career or vengeance so direful that London was shocked"

"the dread presence of the headmaster"

"polio is no longer the dreaded disease it once was"

"a dreadful storm"

"a fearful howling"

"horrendous explosions shook the city"

"a terrible curse"