Lethality refers to the potential to cause death or serious harm. There are several synonyms for the word lethality including deadliness, fatalness, morbidity, mortality, perilousness, and dangerousness. Each of these words conveys the seriousness of the situation and the potential consequences. Deadliness and fatalness imply that the outcome is most likely to result in death whereas morbidity and mortality suggest the presence of illness or death. Perilousness and dangerousness indicate the potential for harm even if death is not the immediate result. Regardless of the synonym used, lethality should always be taken seriously and proper precautions should be taken to prevent harm.