astonishing
Webster's Unabridged Dictionary:
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As·ton·ish·ing
a.
Very wonderful; of a nature to excite astonishment; as, an astonishing event.
Syn. -- Amazing; surprising; wonderful; marvelous.
As·ton·ish·ing·ly, adv. -- As·ton·ish·ing·ness, n.
Antonyms by Answers.com:
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astonishing
adj
Definition: surprising
Antonyms: boring, dull, expected
