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mad dog

mad dog

3 7.9
A person who acts violently and without control
  • noun
  • /mæd dɔg/
  • Offensive
translation icon : perro rabioso
  • He became a mad dog during the argument, shouting and throwing things everywhere.

Examples

Synonyms

maniac
vsmad dog
  • Offensive
149 8.1

A person who behaves wildly and dangerously and may hurt others

is aggressive or irrational without the strong violent obsession
madman
vsmad dog
  • Offensive
95 6.4

A man who acts very strangely or dangerously and may be mentally ill

is more specifically aggressive in action rather than only foolish
nutcase
vsmad dog
  • Offensive
52 8.6

A person who behaves very strangely and may be dangerous

focuses more on active aggression rather than occasional danger
lunatic
vsmad dog
  • Offensive
51 6.2

A person who acts in a wild or reckless way

is more likely to include active aggression as well as irrationality
total psycho
vsmad dog
  • Offensive
2 9.1

A person who acts in a very angry, dangerous, or unpredictable way

adds more emphasis on aggressive actions rather than just craziness
junkyard dog
vsmad dog
  • Informal
1 8.4

A person who is very aggressive to protect their friends or area

is similar but stresses irrational wildness rather than protective aggression
madcap
vsmad dog
  • Informal
1 7.9

A person who does risky things without thinking

is harsher and more violently irrational rather than playful recklessness
total nutcase
vsmad dog
  • Offensive
1 8.8

A person who acts in a way that seems crazy

moves beyond eccentricity to include wild aggressive behaviour
total whackjob
vsmad dog
  • Offensive
9.9

A person who behaves in a very strange and unreasonable way that worries others

leans more toward violent or aggressive acting rather than only absurdity
dire wolf
vsmad dog
  • Informal
9.8

A very fierce and ruthless person in competition or fights

is more about uncontrolled or irrational behaviour than pure ruthlessness
meshugana
vsmad dog
  • Offensive
9.9

Very silly or clearly crazy

is similar but highlights active aggression rather than mere foolishness

Antonyms

A person who does not get nervous in difficult situations

How Aggressive

mad dog
  • Offensive
3 7.9
maniac
  • Offensive
149 8.1
bully
  • Offensive
301 3.2
hothead
  • Offensive
23 6.2
troublemaker
  • Offensive
69 4.1

Surface Forms

mad dog singular
mad dogs plural

Morphology

mad + dog

The meaning 'a person who acts in a wildly aggressive or irrational manner' is directly derivable from combining 'mad' (wildly irrational/angry) with 'dog' (used colloquially for a person); the animal-based insult pattern is transparent and widely attested cross-linguistically. A B1 learner who knows both words can reasonably infer the figurative sense without prior exposure.

Etymology

The noun mad dog comes from the image of a dog sick with rabies: a mad dog bites and acts wildly, without control. So calling someone a mad dog compares them to that dangerous animal and means they are 'very aggressive or not thinking clearly'.