different between quietly vs stealthily

English

quiet +? -ly

quietly (comparative more quietly, superlative most quietly)

stealthy +? -ly

stealthily (comparative more stealthily, superlative most stealthily)

In a stealthy manner, furtively.
- 1912: Edgar Rice Burroughs, Tarzan of the Apes, Chapter 5
  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.

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