All 4 Uses

scarcity
in
Twelfth Night
(Auto-generated)

He is very well-favoured, and he speaks very shrewishly; one would think his mother's milk were scarce out of him.†
p. 35.7 *

scarce = in short supply OR barely or hardly (by a small margin)
Would you'd pardon me; I do not without danger walk these streets: Once in a sea-fight, 'gainst the count, his galleys, I did some service; of such note, indeed, That, were I ta'en here, it would scarce be answered.†
p. 109.5
Ay, but he will not now be pacified: Fabian can scarce hold him yonder.†
p. 129.3
There's no remedy, sir: he will fight with you for's oath sake: marry, he hath better bethought him of his quarrel, and he finds that now scarce to be worth talking of: therefore, draw for the supportance of his vow; he protests he will not hurt you.†
p. 129.8

Definitions:

(1) (scarcity)
shortage (having an amount that is less than desired)
(2) (meaning too rare to warrant focus)
More rarely (and typically in classic literature), scarce can be short for scarcely or hardly or barely or by a small margin -- such as in "She was scarce ten years old," or "I scarce know why."