Calamitousness is a word that denotes a state of being causing great harm or disaster. In order to express the same sentiment in different words, one can use synonyms such as disastrousness, cataclysmic, devastating, ruinous, and catastrophic. These words all convey the same message of unwanted and catastrophic events. Furthermore, similar alternatives to calamitousness are devastatingness, catastrophism, and woe. These synonyms can help better describe the level of chaos and destruction that the word calamitousness implies. No matter which word one uses, the severity of destruction caused by calamities is clearly conveyed with each one.