The phrase "abnormally fast" is correct and usable in written English.
It can be used to describe something that is occurring at a speed that is significantly higher than what is considered normal or typical.
Example: "The car was moving abnormally fast, causing concern among the pedestrians."
Alternatives: "unusually quick" or "excessively rapid".
As we jumped off the truck, my heart was beating abnormally fast, pounding like a drum.
The monitor, which Mr. Cheney wore on his belt for 34 hours, revealed brief episodes of abnormally fast heartbeat.
They are actually an abnormally fast shunting of blood through the arteries and veins of the dura.
In Mr. Cheney's case, it detected four brief episodes of abnormally fast beats that lasted for up to two seconds, Dr. Reiner said.
An experimental nasal spray shows promise for quickly treating an abnormally fast heart rhythm known as supraventricular tachycardia (SVT), a new study reports.
Over a few months, I had several episodes of tachycardia (an abnormally fast heartrate), one time ending up in A&E because my heart would not calm down.
Slow motion is the process of capturing scenes on film at an abnormally faster than average rate, followed by instant play-back.
First, autophagy appears to be predominantly relevant in the liver after abnormally long fasting periods.
Niacin megadoses, however, are associated with a host of untoward effects: flushing of the face, neck and chest; abnormal heart rhythms; itching; headache; cramps; nausea and vomiting; diarrhea; abnormally low blood pressure; fast heart beat, and elevated blood sugar.
Thirty two of these women had abnormally high level of fasting glucose.
A detailed statistical analysis of response times on a four-choice reaction time task demonstrated explicitly how a greater proportion of abnormally slow responses, mixed with fast responses on some trials, leads to the inconsistent pattern of responding in ADHD [ 18].
