2. Unusual or unexpected; especially, in a way that causes alarm or anxiety: "The abnormal extremes in weather conditions are causing officials to declare mandatory evacuations which is resulting in a great deal of stress for residents in certain areas of the world."
3. Much greater than the normal or the usual: "Abnormal profits might be blamed for the financial crisis that exists these days."
4. Departing from the normal or what is usually expected; for example, in intelligence and physical development: "The parents were very distressed when they found out that their daughter was considered to be intellectually abnormal in school."
"The abnormal circumstances surrounding their young daughter's decision to travel caused a great deal of concern among her relatives."
"The neighbor's cat has an abnormal fear of birds."
5. Etymology: This word was once spelled anormal and it came from the Greek anomalos, meaning irregular. Later the b was added by analogy with the Latin word for irregular, abnormis. based on Latin ab-, "from" + norma, "norm"; and so, "away from the norm".Abnormal can mean either below normal or above normal; so, either better or worse than normal: "Einstein had an abnormal IQ while an ignorant person also has an abnormal IQ." On the other hand, subnormal always means below or worse than normal.
In referring to a growth, abnormal may mean that it is cancerous or premalignant; that is, likely to become cancer.
2. An abnormal (irregular) amount of snow fell in October.
Abnormal can mean either below or above normal, either better or worse than normal: "Einstein had an abnormal IQ."
On the other hand, subnormal always means below or worse than normal.
Origin:This word was once spelled anormal and came from the Greek anomalos, meaning irregular.
Later the b was added by analogy with the Latin word for irregular, abnormis, based on Latin ab-, "from" + norma, "norm"; hence "away from the norm".