different between stealthily vs stealthfully

English

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.

stealthful +? -ly

stealthfully (comparative more stealthfully, superlative most stealthfully)

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