The term 'acutely sensitive' can be described as 'KEEN' in four letters. Acutely sensitive means having a heightened awareness or perception of something, often to the point of being overly sensitive. It is usually used to describe someone who is very aware of their surroundings and can pick up on subtle changes or nuances. This heightened sensitivity can be both a blessing and a curse, as it can make someone more aware of the beauty and complexity of the world, but also more vulnerable to pain and suffering.