3 Was drowned in the depth of deadly sleep,

deadly > death-like

4 Fair Malecasta, whose engrieved spirit

engrieved > aggravated

5 Could find no rest in such perplexed plight,

perplexed > troubled

6 Lightly arose out of her weary bed,

Lightly > Quickly, easily; unchastely

7 And, under the black veil of guilty Night,

Night > (Nox; see 105.20 ff.)