• WordNet 3.6
    • adv lengthily in a lengthy or prolix manner "the argument went on lengthily","she talked at length about the problem"
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Webster's Revised Unabridged Dictionary
    • adv Lengthily In a lengthy manner; at great length or extent.
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Century Dictionary and Cyclopedia
    • lengthily In a lengthy manner; at great length.
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In literature:

He pronounced the inhibition lengthily and sonorously, so that the 'not' sounded like 'n-o-o-o-t!
"A Pair of Blue Eyes" by Thomas Hardy
I only know that after talking so lengthily he fell into a nine days' silence.
"The Virginian" by Owen Wister
They drank hard and lengthily in toasts to "The ladies of Algiers" and "The freedom of Montenegro!
"Tartarin of Tarascon" by Alphonse Daudet
He wrote in the theologian's vein, lengthily and bitterly; his friends listened in silence.
"A Popular History of France From The Earliest Times Volume V. of VI." by Francois Pierre Guillaume Guizot
They finally arrived in the country of our friend Comogre, of whom I have lengthily spoken above.
"De Orbe Novo, Volume 1 (of 2)" by Trans. by Francis Augustus MacNutt
Masquerier stared at him lengthily with gunmetal-blue eyes.
"A Diversity of Creatures" by Rudyard Kipling
Seizing this opportunity, Dick Lancaster stopped the captain, who he saw was preparing to go lengthily into the recent affair.
"The Captain's Toll-Gate" by Frank R. Stockton
I nead not lengthily describe this interview.
"The Honorable Miss" by L. T. Meade
Randolph opposed it with firmness, and pretty lengthily.
"Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson" by Thomas Jefferson
Modesty may suffer from a lengthily savoured kiss between two Pietists of eighteen.
"Voltaire's Philosophical Dictionary" by Voltaire

In science:

Approximate pseudospin symmetry has been also found and analyzed in deformed nuclei - before a general explanation were suggested and lengthily accepted.
New insight on pseudospin doublets in nuclei