This is the 7457th most frequent Japanese word.
健
"健" means "healthy" or "strong" in English.
In this sentence, '健' is used as the root of '健やか', which means 'healthy'. It describes the physical state of health.
彼は体が健やかです。
He is physically healthy.
Here, '健' is part of the name '健吾'. In names, it often represents qualities such as health and robustness.
健吾さんは真面目です。
Mr. Kengo is serious.
In this sentence, '健やかに' is used to describe the state of the mind, emphasizing mental health and well-being.