Wonderful

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late Old English wunderfull (see wonder, -ful).

wiktionary

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From Middle English wonderful, wondirful, from Old English wundorful(“wonderful”), from Proto-West Germanic *wundrafull, equivalent to wonder +‎ -ful. Cognate Dutch wondervol(“wonderful”), German wundervoll(“wonderful”).

etymonline

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wonderful (adj.)

late Old English wunderfoll; see wonder (n.) + -ful. Related: Wonderfully.