Definition of "stealthily"

The dog obeyed the significant beck of his finger, and they drew off, stealthily, together.

1838, Boz [pseudonym; Charles Dickens], Oliver Twist; or, The Parish Boy’s Progress. […], volumes (please specify |volume=I, II, or III), London: Richard Bentley, […]

So intent was he upon this personal appraisement of his features that he did not hear the parting of the tall grass behind him as a great body pushed itself stealthily through the jungle; nor did his companion, the ape, hear either, for he was drinking and the noise of his sucking lips and gurgles of satisfaction drowned the quiet approach of the intruder.

1912 October, Edgar Rice Burroughs, “Tarzan of the Apes”, in The All-Story, New York, N.Y.: Frank A. Munsey Co.; republished as chapter 5, in Tarzan of the Apes, New York, N.Y.: A. L. Burt Company, 1914 June,