If you are taken unawares by something unexpected, you can describe that feeling with the adjective surprised. Look surprised when your friends plan a party without telling you, even if you see the cars in the driveway and know what's going on.

Surprised originally meant attacked unexpectedly. It was from the Old French surprendre meaning to overtake, with the root prendere from the Latin word for seize. Surprised has synonyms in words like astonished, amazed, and flabbergasted, but the latter three convey a greater sense of shock or bewilderment. You are surprised by the party, amazed that your old friend came, and flabbergasted to learn she is actually your sister.

Definitions of surprised

adj taken unawares or suddenly and feeling wonder or astonishment

surprised by her student's ingenuity”
surprised that he remembered my name”
“a surprised expression”
amazed, astonied, astonished, astounded, stunned
filled with the emotional impact of overwhelming surprise or shock
dumbfounded, dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied, thunderstruck
as if struck dumb with astonishment and surprise
utterly astounded
goggle-eyed, openmouthed, popeyed
with eyes or mouth open in surprise
(British informal expletive) surprised
excited by sudden surprise or alarm and making a quick involuntary movement
not surprised, unsurprised
not surprised or expressing surprise

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