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Webster 1828 Edition

Adj.

Dull; stupid; sad; melancholy; depressed in spirits; as, he lives a dumpish life.

dumpish ‎(comparative more dumpish, superlative most dumpish)

(obsolete) Stupid, dull.
Sad, melancholy.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.12:
  But at last they found, she was but in a deepe study, and dumpish retracting into her selfe, exercising her minde, and preparing her voice […].