scared stiff (?.)
- aghast
- appalled
- ashen
- astounded
- awed
- awestricken
- awestruck
- blanched
- cowed
- deadly pale
- frozen
- gray with fear
- horrified
- horror-struck
- intimidated
- pale as death
- pallid
- paralyzed
- petrified
- scared to death
- stunned
- stupefied
- terrified
- terror-crazed
- terror-haunted
- terror-ridden
- terror-riven
- terror-shaken
- terror-smitten
- terror-struck
- terror-troubled
- undone
- unmanned
- unnerved
- unstrung