also formerly surprize, late 14c., "overcome, overpower" (of emotions), from the noun or from Anglo-French surprise, fem. past participle of Old French surprendre (see surprise (n.)). Meaning "come upon unexpectedly" is from 1590s; that of "strike with astonishment" is 1650s.
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Definitions of surprising from WordNet
causing surprise or wonder or amazement;
leaped up with surprising agility
the report shows a surprising lack of hard factual data