Crossword Dictionary

DISCONCERT

confuse, flurry, disconcert, put off - v 
cause to feel embarrassment; "The constant attention of the young man confused her" 

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Synonyms

abash, confound, confuse, discomfit, discountenance, embarrass, faze, fluster, mortify, nonplus, rattle

merriam-webster

Examples

His capricious humour elevated and deposed them with the same disconcerting suddenness.

She heard disconcerting sounds of heavy weapons fire in the distance, and the forest smelled as if it were burning.

When you're used to wearing a certain type of underwear, trying new ones can be a bit disconcerting.

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Etymology

"throw into confusion," 1680s, from French disconcerter (Modern French déconcerter) "confused," from dis- "do the opposite of" (see dis-) + concerter (see concert (v.)). Related: Disconcerted; disconcerting; disconcertingly.

etymonline