The phrase "abnormal amount" is correct and usable in written English.
It can be used to describe a quantity that is unusual or outside the norm in a particular context.
Example: "The study revealed an abnormal amount of stress among the participants, indicating a need for further investigation."
Alternatives: "unusual quantity" or "excessive amount".
To put it bluntly, we have abnormally large penises banging away at vaginas and rectums for an abnormal amount of time.
Doctors discovered arrhythmia, an abnormal amount of electrical activity in the heart, during Thorn's knee-replacement surgery in August.
Lactosuria (abnormal amount of lactose in the urine) may occur in nursing mothers.
Francis, who missed seven games because of migraines last season, has Meniere's disease, the result of an abnormal amount of fluid in the inner ear.
The team insisted that Alosi acted alone, which would constitute an abnormal amount of sideline power for a strength coach.
Ian Chappell on David Boon's drinking, 1989 There was an abnormal amount of travel sickness on the Qantas flight to London, and approximately 99.94% of it was self-inflicted.
So far so good, you might think, except that this year's award has prompted abnormal amounts of grousing.
A physician assistant found that abnormal amounts of protein were spilling out in his urine.
His urine sample contained what appeared to be abnormal amounts of the hormone EPO, which enhances the blood's oxygen-carrying capacity.
Rivaling Jupiter in size, it has the potential to bathe Earth with intense storms that could expose airplane passengers to abnormal amounts of radiation around Thanksgiving.
The prosecution maintains that the analysis of the remains was valid, and that it clearly indicated abnormal amounts of epinephrine, particularly in two patients who were not given epinephrine as part of their treatment.
