Princeton's WordNet

1. madly, frantically(adverb)

   in an uncontrolled manner

   "she fought back madly"

2. insanely, crazily, dementedly, madly(adverb)

   in an insane manner

   "she behaved insanely"; "he behaves crazily when he is off his medication"; "the witch cackled madly"; "screaming dementedly"

3. madly, insanely, deadly, deucedly, devilishly(adverb)

   (used as intensives) extremely

   "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous"

Kernerman English Learner's Dictionary

1. madly(adverb)ˈmæd li

   in a crazy or extreme way

   They were madly in love.; as they waved their arms madly at the plane

Wiktionary

1. madly(Adverb)

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

   I'm madly in love with you.

Webster Dictionary

1. Madly(adj)

   in a mad manner; without reason or understanding; wildly

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