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Webster 1913 Edition

adv.

[From

Adj.

]

In a mad manner; without reason or understanding; wildly.

[wns=2]

Syn. – insanely, crazily, dementedly.

adv.

[from mad.] Without reason or understanding; rashly; wildly.

With extreme folly or infatuated zeal or passion.

madly ‎(comparative madlier or more madly, superlative madliest or most madly)

In a mad manner; without reason or understanding; wildly.
I'm madly in love with you.

in a mad manner