Definition of impervious. 1  1a : not allowing entrance or passage : impenetrable a coat impervious to rainb : not capable of being damaged or harmed a carpet impervious to rough treatment. 2  2 : not capable of being affected or disturbed impervious to criticism.
Ideally, all should aim to keep their waist measurement less than half that of their height, found the scientists. That means a 6ft (72 inch) tall man should aim to keep his waist less than 36 inches, while a 5ft 4in (64 inch) woman should keep hers under 32 inches.They have found that the easy-to-calculate ratio between the two is a better predictor of risk than the most widely measure of obesity, called body mass index (BMI).hat means a 6ft (72 inch) tall man should aim to keep his waist less than 36 inches, while a 5ft 4in (64 inch) woman should keep hers under 32 inches. They have found that the easy-to-calculate ratio between the two is a better predictor of risk than the most widely measure of obesity, called body mass index (BMI).
Tips & Warnings. 1  You may want to take your measurements in front of a full-length mirror to ensure you are measuring the right area and that the measuring tape isn't crooked. 2  A healthy waistline for a woman is between 32 and 23 inches. 3  For a man, it's between 45 and 32 inches.ind your natural waist. An easy way to do this is to stand in front of the mirror and bend at your side. The crease that forms indicates your natural waistline, directly above the belly button and below the ribcage. Wrap the measuring tape completely around your waist starting at the belly button.