In a manner that inspires awe or amazement; awesomely or wonderfully.
From 'aw' (variant of 'awe') plus '-ingly' (adverbial suffix from 'in' + '-ly'). The suffix '-ingly' is a secondary adverbial formation combining '-ing' with '-ly'.
The suffix '-ingly' is pretty rare and archaic—words like 'awingly,' 'seemingly,' and 'knowingly' use it, but modern English usually just sticks with '-ly' on most adverbs. It's a fossil of older word-building patterns!
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