oppressively heavy; onerous.
distressing; troublesome.
Nautical. having a full hull form, as a merchant vessel built for capacity rather than speed.

1570–80; burden1 + -some1

burdensomely, adverb
burdensomeness, noun
nonburdensome, adjective
nonburdensomely, adverb
nonburdensomeness, noun
unburdensome, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
burdensome (ˈbɜːdənsəm)
hard to bear; onerous

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

1570s, from burden (1) + -some. Earlier was burdenous (1520s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
With a hydration bladder, the added weight on the shoulders proved to be
  burdensome over time with conventional daypacks.
But here they play the odds the way they see them, and perfect safety is
  burdensome and unnecessary.
Particularly burdensome are proposed standards for record-keeping, they say.
We ought to be building more plants but the regulatory and legal bureaucracy is
  so burdensome that the cost is prohibitive.
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