1
: to an extreme or excessive degree
He told her that he loved her madly.
a madly ambitious businessman
She fell madly in love with him.
2
: in a mad or insane way
He pulled out a knife and started waving it around madly. [=wildly]
grinning madly
Cite this Entry
“Madly.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/madly. Accessed 24 Jun. 2026.
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