That was disconcerting.

I was very disconcerted to find that everyone else already knew it.

I don't mean to disconcert you, but there's a spider in your hair.

On Tom's first visit to another inhabited planet he found it disconcerting to be referred to as an extraterrestrial.

It was disconcerting.

The alacrity with which she was greeted felt disconcerting, given the chilly reception she had experienced before.

I found his pretentious demeanor quite disconcerting.

I was most disconcerted.

Tom was disconcerted by the announcement.

It's disconcerting.