unnerve   verb [T]
 to make (someone) feel less confident and slightly frightened
 I think it unnerved me to be interviewed by so many people.
 He's quite a sociable baby but I think it unnerves him to have so many strangers in the
 room.
 The long silence unnerved him.

 unnerving   adjective
 Meeting a twin brother I didn't know I had was an unnerving experience.
 It's the way that he stares that I find so unnerving.
 Even for the toughest child, the first day at school is bound to be an unnerving
 occasion.
 I don't study the opposition very hard before a race - I find it too unnerving.

 unnervingly   adverb