1. (adverb) in fear,

• fearful

2. (adverb) in an alarming manner

• awful
• dire
• direful
• dread
• dreaded
• dreadful
• fearful
• fearsome
• frightening
• horrendous
• horrific
• terrible

1. (adverb) in fear,

• dauntlessly
• fearlessly
• intrepidly