For Morbidly obese we have a term and definition in Fitness.

40 and above
The BMI formula does not take into account your body composition (percent muscle vs. fat) and is therefore less accurate if you have a non-typical amount of muscle. This is because while a person with an above average amount of muscle is likely to be healthier because of it, the formula simply interprets the added muscle as fat and overestimates obesity. Conversely, with older persons and others with a below average amount of muscle, it underestimates obesity.
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