Valetudinary is a word often used to describe someone who is constantly ill or complaining about their health. However, there are several other words and phrases that can be used interchangeably, including hypochondriac, invalid, infirm, delicate, frail, sickly, or ailing. Each of these words reflects a different nuance of the idea of being frequently unwell, from someone who obsesses over minor illnesses to someone with a more serious and chronic condition. Depending on the context, any of these synonyms might be a good choice for expressing the concept of poor health and frequent complaints.