In a persevering manner; with perseverence.(adverb)
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Use "perseveringly" in a sentence
"In her studies Lisa worked well, that is to say perseveringly; she was not gifted with specially brilliant abilities, or great intellect; she could not succeed in anything without labour."
"The blundering centuries have perseveringly pottered and groped through the dark; but it remained for Kipling's century to roll in the sun, to formulate, in other words, the reign of law."
"From the words of the Prophet Ezekiel it is clear that the Lord wishes all His people to proceed patiently and perseveringly towards the goal of full unity."