disconcerted
adjective
[ ˌdɪskənˈsəːtɪd ]
• unsettled or confused.
• "Keith looked momentarily disconcerted"
disconcert
verb
• disturb the composure of; unsettle.
• "the abrupt change of subject disconcerted her"
Similar:
unsettle,
nonplus,
discomfit,
throw/catch off balance,
take aback,
unnerve,
disorient,
perturb,
disturb,
perplex,
confuse,
bewilder,
baffle,
fluster,
ruffle,
shake,
upset,
agitate,
worry,
dismay,
put out of countenance,
discountenance,
discompose,
surprise,
take by surprise,
startle,
stop someone in their tracks,
distract,
embarrass,
abash,
throw,
faze,
discombobulate,
rattle,
psych out,
cause to be at a stand,
gravel,
Origin:
late 17th century (in the sense ‘upset the progress of’): from obsolete French desconcerter, from des- (expressing reversal) + concerter ‘bring together’.