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The Collaborative International Dictionary
Dumpishness

Dumpish \Dump"ish\, a. Dull; stupid; sad; moping; melancholy. `` A . . . dumpish and sour life.''
--Lord Herbert. -- Dump"ish*ly, adv. -- Dump"ish*ness, n.

Wiktionary
dumpishness

n. Quality of being dumpish.