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Webster 1828 Edition

adv.

In a dejected manner; sadly; heavily.

dejectedly ‎(comparative more dejectedly, superlative most dejectedly)

In a dejected manner, in a dispirited way.
- 1995 (date of the publication of the anthology), Douglas Adams, The Hitch Hiker's Guide to the Galaxy: a Trilogy in Five Parts, ISBN 0434003484, page 202:
  From his diembodied mind Gargravarr watched dejectedly.