Why is Mathilde dismayed when her husband shows her the invitation to the ball at the palace of the Ministry in "The Necklace"?
She thinks the people who will be at the ball will be unfriendly to her. She thinks the people who will attend are beneath her class. She becomes nervous and anxious when she is in large crowds. She has nothing appropriate to wear to the formal ball.
The correct comparative to the adverb healthfully is more healthfully, and the superlative is most healthfully. As has been pointed out admirably elsewhere in this post, healthfully is not a commonly used adverb. However, that does not make it incorrect to use it.
