Water lost through skin evaporation and exhaled breath, of which a person is normally unaware, is termed:

1. Most water loss is through urine, which a person is very aware of. 2. Some water also leaves via evaporation from skin (without overt sweating) and via exhaled air from the lungs. 3. Because a person does not notice this loss happening, It insensible water loss. 4. 'Diuretic' and 'osmotic' water loss is the term used for this route. 5. So insensible water loss is correct. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", p.1256 §Water Balance_