A nutrition, metabolism, and development symptom that is characterized by a physical decline in health seen in older adults – typically those with multiple chronic medical conditions – resulting in decreased appetite and poor nutrition, weight loss, inactivity, often accompanied by dehydration, depression, decreasing functional ability, and impaired immune function. [ url:https://www.compassus.com/for-caregivers/what-is-adult-failure-to-thrive url:https://www.uptodate.com/contents/failure-to-thrive-in-older-adults-evaluation ]