formidable:He is a kind,but unfortunately with a formidable face.
fright  n.
terror  n.
terrify:The animals was terrified by the storm.
panic:the rumor that we are having an earthquake arouse a panic.
horror
dread:John dreads calculating his taxes.
cower(recoil):The children cowered each time they heard the thunder.
intimidate:I don't want to intimidate you,but very few people pass the exam.
menace:The people are being menaced by the threat of war.