Disconcert often implies an emotional response like stress or anxiety after being thrown off balance. His aggressive questioning disconcerted the witness.
Pro Tip 2/3
Not Always Negative
While usually negative, 'disconcert' can also refer to benign surprise or mild confusion. The magician's act disconcerted the audience with its unexpected finale.
Pro Tip 3/3
Temporary Effect
'Disconcert' often suggests a temporary state; the confusion isn't usually permanent. The loud noise disconcerted me for a moment.