Agonising is a term used to describe an intense feeling of pain or distress. It can be described as PAINFUL, HEARTRENDING, HARROWING and EXCRUCIATING. PAINFUL is a 7 letter word that means causing physical or mental suffering. HEARTRENDING is a 12 letter word that describes something so emotionally moving that it causes one to feel deep sorrow. HARROWING is a 9 letter word that means extremely distressing or disturbing. EXCRUCIATING is a 12 letter word that means extremely PAINFUL or intense.