In a rapacious manner, greedily, with great appetite(adverb)
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Use "rapaciously" in a sentence
"He could feel those fingers worming into his brain, chewing into his thoughts and rapaciously digesting what they found."
"Surely he would be astonished to see himself inflated into yet another biographical Gargantua, not to mention in a book that feeds rapaciously on his most unattractive if not repellent aspects: his obsessive, divided sexuality, his spectacular alcoholism, his failures as husband and father."
"Here the humanoid on display was a rapaciously acquisitive creature engaged in elaborate and expensive mating rituals."