Morbidity refers to the state of being unwell or sickly. There are several synonyms to this word which include illness, disease, affliction, ailment, infirmity, malady, sickness, pathology, and complaint. All these terms refer to a variety of physical or mental disorders that affect the well-being of an individual. On the other hand, morbidity can also be used in a broader sense to describe the quality of being unhealthy or unpleasant. In this context, words such as decay, deterioration, degradation, and decline can be used as synonyms for morbidity. These terms are often used to describe the deteriorating quality of something or someone, be it an environment, situation, or human condition.