Princeton's WordNet

1. lunacy, madness, insaneness(noun)

   obsolete terms for legal insanity

2. rabies, hydrophobia, lyssa, madness(noun)

   an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain

3. fury, rage, madness(noun)

   a feeling of intense anger

   "hell hath no fury like a woman scorned"; "his face turned red with rage"

4. folly, foolishness, craziness, madness(noun)

   the quality of being rash and foolish

   "trying to drive through a blizzard is the height of folly"; "adjusting to an insane society is total foolishness"

5. madness, rabidity, rabidness(noun)

   unrestrained excitement or enthusiasm

   "poetry is a sort of divine madness"

Kernerman English Learner's Dictionary

1. madness(noun)ˈmæd nɪs

   a situation that seems to make no sense

   the madness that followed the explosion; It's madness to pay all that money.

Wiktionary

1. madness(Noun)

   The state of being mad; insanity; mental disease.

2. madness(Noun)

   rash folly

Webster Dictionary

1. Madness(adj)

   the condition of being mad; insanity; lunacy

2. Madness(adj)

   frenzy; ungovernable rage; extreme folly

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