Princeton's WordNet
surreptitiously, sneakilyadverb
in a surreptitious manner
Synonyms:
sneakily, surreptitiously
Dictionary of English Synonymes
surreptitiouslyadjective
Synonyms:
fraudulently, by stealth, without authority
PPDB, the paraphrase database
List of paraphrases:
stealthily, clandestinely
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