Etymology
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wondrous (adj.)

c. 1500, from Middle English wonders (adj.), early 14c., originally genitive of wonder (n.), with suffix altered by influence of marvelous, etc. As an adverb from 1550s. Related: Wondrously; wondrousness.

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Definitions of wondrous
1
wondrous (adv.)
(used as an intensifier) extremely well;
Synonyms: wonderfully / wondrously / superbly / toppingly / marvellously / terrifically / marvelously
2
wondrous (adj.)
extraordinarily good or great; used especially as intensifiers;
From wordnet.princeton.edu