verb (used without object)
to become less.
verb (used with object)
to make less; reduce.
Archaic. to represent as less; depreciate; disparage.

1300–50; late Middle English lessenen, lasnen (see less, -en1); replacing Middle English lessen

unlessened, adjective

lessen, lesson.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lessen (ˈlɛsən)
1.  to make or become less
2.  (tr) to make little of

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

"to become less," c.1300, from less (q.v.). Related: Lessened; lessening.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They also designed the dome's interior as a series of recessed panels, which
  lessened the amount of concrete needed.
The degree to which people want to do the harder treks has lessened
His art is not lessened by being honest about his science, and his early
  political use of twisted science.
Third and fourth are marked by a lessened capacity to function in a number of
  bodily activities.
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