Hardly
Part of speech: adverb
Definition: Firmly, vigorously, with strength or exertion. Harshly, severely. With difficulty. Barely, only just, almost not.
Example sentence: A friend is long sought, hardly found, and with difficulty kept.
Scarcely
Part of speech: adverb
Definition: In a scarce manner.Probably not.Certainly not.Almost not at all; by a small margin.
Example sentence: Nature gives to every time and season some beauties of its own; and from morning to night, as from the cradle to the grave, it is but a succession of changes so gentle and easy that we can scarcely mark their progress.