In a wild, frenzied way, or with extreme intensity of emotion like love or anger.
From 'mad' + '-ly' (adverb suffix); 'mad' originally meant 'affected by illness' in Old English, evolved to mean 'insane' and then 'wild and excited.'
Madly shows how we use mental health language casually—saying you're 'madly in love' borrows from describing actual mental illness, a linguistic pattern that reveals how people have always mixed emotions with madness.
Complete word intelligence in one call. Free tier — 50 lookups/day.