He furtively tip-toed past his parents' room, making sure that he wouldn't wake them up as he snuck out of the house.
The intelligence officer crept furtively around the building collating information as he went.
The senator glanced furtively toward his aide as he answered the questions. Furtively means do something with stealth. Synonyms for furtively we would be; secretly, hidden, surreptitiously, slyly, stealthily, underhandedly.
The word "furtively" is an adverb. It describes how an action is done, in a secretive or sneaky manner.
The word furtively is an adverb. You can easily spot adverbs as most of them end in -ly.
I am not writing a sentence using that word.
furtively, inconspicuously, nervously, quietly
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