Other forms: disconcerting, disconcerted
To disconcert is to throw somebody off their balance of mind. A disconcerting question, disconcerted by the silence, oddly disconcerting.
The adjective is the commonest form, and disconcerting is a wonderfully polite word for deeply unsettling. It is about composure rather than fear, so somebody disconcerted has lost their footing rather than their nerve.
1verbdisconcertTo throw somebody off their balance of mind.
“His habit of staring without blinking tends to disconcert new colleagues.”
disconcert is an unsettling.
Middle French desconcerter is des-, undoing, plus concerter, to bring into agreement.
Middle French
desconcerter
English, today
disconcert
Built from
From Middle French desconcerter, from des- (“dis-”) + concerter (“to bring into agreement, organize”).
Etymology from Wiktionary, CC BY-SA