lengthy

[lengk-thee, leng-, len-]
adjective, lengthier, lengthiest.
1.
having or being of great length; very long: a lengthy journey.
2.
tediously verbose; very long; too long: a lengthy speech.

Origin:
1680–90, Americanism; length + -y1

lengthily, adverb
lengthiness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lengthy (ˈlɛŋkθɪ, ˈlɛŋθɪ)
 
adj , lengthier, lengthiest
of relatively great or tiresome extent or duration
 
'lengthily
 
adv
 
'lengthiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

lengthy
1759, Amer.Eng., from length + -y (2). Until c.1840 always characterized in British English as an Americanism.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And his meticulousness extended to lengthy and vigilant postoperative care.
The high cost of research ships and the sheer size of the sea make marine data
  collection a lengthy procedure.
Raising a potential guide dog is a serious and lengthy proposition.
He began writing captions, sometimes quite lengthy, on each print.
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