Gesundheits is not a very commonly used English word, as it comes from German and literally translates to mean 'health'. If you're looking for synonyms for this word, there are plenty of options that are commonly used in English. For example, 'wellness' and 'healthiness' can both be used to describe a state of being healthy. Alternatively, 'fitness' can refer specifically to physical health, while 'well-being' is a more general term that encompasses mental and emotional health as well. Other synonyms might include 'vigour', 'vitality', and 'good health', all of which imply a strong and positive state of physical or mental health.