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We found 3 dictionaries that define the word dullen:

General (2 matching dictionaries)
  1. dullen: Wiktionary
  2. Dullen: Rhymezone

Slang (1 matching dictionary)
  1. dullen: Urban Dictionary

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Definitions from Wiktionary (dullen)

▸ verb:  (transitive, nonstandard) To make dull or duller; to dull.
▸ verb:  (intransitive, nonstandard) To become dull or duller; to dull.

Similar:
dull, fordull, undull, dampen, mull, dumbify, dozzle, deaden, damp, pall, more...

Opposite:
sharpen, enhance, stimulate, invigorate, animate

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Similar:
dull, fordull, undull, dampen, mull, dumbify, dozzle, deaden, damp, pall, more...

Opposite:
sharpen, enhance, stimulate, invigorate, animate



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