voyeuristically
Adverb
Meaning
like a voyeur
Source: WordNetSynonyms
covertly
curiously
intently
stealthily
furtively
observantly
inquisitively
pryingly
privately
attentively
surreptitiously
watchfully
clandestinely
secretively
meddlesomely
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Examples
What I said was, the NSA does not voyeuristically pore through U.S. citizens' e-mails. I stand by that.
he sneaks voyeuristically around the swimming pool