Perhaps intimidating will work:
###Intimidate###
Intimidate
- To make timid or fearful; frighten
To make timid or fearful; frighten
- To compel or deter by or as if by threats
To compel or deter by or as if by threats
The employees are scared to ask the boss to extend the deadline because he is intimidating.
North Korea's dictator is so intimidating that nobody dares to oppose him.
(MWD)