That was disconcerting.

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

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

It was disconcerting.

It's disconcerting.

I was most disconcerted.

Tom seemed disconcerted by the announcement.

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.

Tom was disconcerted by the announcement.