Definition of "feebly"

Feebly ſhe ſhriekt, but ſo feebly indeed / That Britomart heard not the ſhrilling ſound.

1596, Edmund Spenser, “Book IV, Canto VII”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, stanza 4, page 95

The hurt nigger moaned feebly somewhere nearby, and then fetched a deep sigh that made me mend my pace away from there.

1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], part I, page 215