adjective, lonelier, loneliest.
affected with, characterized by, or causing a depressing feeling of being alone; lonesome.
destitute of sympathetic or friendly companionship, intercourse, support, etc.: a lonely exile.
lone; solitary; without company; companionless.
remote from places of human habitation; desolate; unfrequented; bleak: a lonely road.
standing apart; isolated: a lonely tower.

1600–10; lone + -ly

lonelily, adverb
loneliness, lonelihood, noun
unlonely, adjective

1. See alone. 4. uninhabited, unpopulated. 5. secluded.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lonely (ˈləʊnlɪ)
adj , -lier, -liest
1.  unhappy as a result of being without the companionship of others: a lonely man
2.  causing or resulting from the state of being alone: a lonely existence
3.  isolated, unfrequented, or desolate
4.  without companions; solitary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from lone + -ly. Related: Loneliness.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Doctors have known for a long time that feeling lonely can make you physically
  sick, but until now they did not know why.
It can be lonely at the top, especially when it comes to global university
It is not that the lonely and the gregarious are genetically different from
  each other.
The lonely polar bear-the unofficial mascot of global warming.
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