Cognitive decline is a commonly used term to describe a decrease in cognitive function over time, often associated with aging or neurological disorders. However, there are several other synonyms that can be used to describe this phenomenon. These synonyms include cognitive impairment, cognitive deterioration, cognitive weakness, mental decline, and brain fog. All of these terms refer to the same general process of a decline in cognitive ability, and they are often used interchangeably in medical and scientific literature. Regardless of the specific term used, it is important to address cognitive decline early on to prevent or delay the onset of more serious conditions.