verb (used with object)
to put into a state of agitated confusion: His constant criticism flustered me.
to excite and confuse with drink.
verb (used without object)
to become agitatedly confused.
nervous excitement or confusion.

1375–1425; late Middle English flostren; cf. bluster, Old Norse flaustra to hurry

unflustered, adjective

1. upset, bewilder, disconcert, disturb. 4. turmoil, agitation, upset, bewilderment, distraction.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fluster (ˈflʌstə)
1.  to make or become confused, nervous, or upset
2.  a state of confusion or agitation
[C15: probably of Scandinavian origin; compare Icelandic flaustr to hurry, flaustra to bustle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 15c. (implied in flostyrynge), from a Scandinavian source (cf. Icel. flaustr "bustle," flaustra "to bustle"). Originally "to excite," especially with drink; sense of "to flurry, confuse" is from 1724. Related: Flustered; flustering.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The change in the guard did not fluster the markets.
The overall impact of the questions, which seemed designed to paint her scholarship as biased advocacy, seemed to fluster her.
Accept the fluster of lost door keys, the hour badly spent.
And who then barges in to retrieve her purse that she left behind in her fluster to clear out.
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