Both Uses of

indefatigable
in
The Scarlet Letter

And, to say the truth, an appetite, sharpened by the east wind that generally blew along the passage, was the only valuable result of so much indefatigable exercise.†
p. 33.8 *

indefatigable = with tireless effort

It indicated the restless vivacity of her spirit, which to-day was doubly indefatigable in its tip-toe dance, because it was played upon and vibrated with her mother's disquietude.†
p. 227.8