scary;  frightening;  eerie;  dreadful
 fearfully;  timidly;  cautiously;  nervously
 curiosity of fear;  urge to look at something frightening;  wanting to take a peek at something unpleasant
 fierce look;  frightening look;  tough look;  aggressive attitude;  coercive attitude;  taking a hard line
 to be afraid of;  to fear;  to dread;  to be nervous (about);  to be shy (of)
 deferential treatment (out of fear)