Never use “tireless” to praise people teaching, nursing, volunteering, doing activist work, etc. I assure you, these people are plenty tired.
@Julie
Unrelenting.
Yeah, use "unrelenting"
@iuculano
Yup. This is the word. I've always felt that "tireless" undermines people's accomplishments. Like they are successful because of a genetic disposition to have more energy or something.
@Julie