1. (adverb) of a dreadful kind

• awfully
• horribly

2. (adverb) in a dreadful manner

• dismally

1. (adverb) of a dreadful kind

• atrocious
• frightful
• horrible
• horrifying
• ugly
• awful
• dire
• direful
• dread
• dreaded
• dreadful
• fearful
• fearsome
• frightening
• horrendous
• horrific
• terrible
• dreadful

2. (adverb) in a dreadful manner

• abominable
• atrocious
• awful
• dreadful
• painful
• terrible
• unspeakable