dullness is how bright a color is, eg dull is very un-bright
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In IQ Dullness means absent mind.
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Some words that rhyme with "dullness" are fullness, sullenness, and mulishness.
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The dullness of the day was very depressing compared to the
sunshine they had last week.
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Definition of mental dullness; describing your personality and
mind set to be bland with no effort to create enlightenment. Eg: a
person with a basic brain with not much character has mental
dullness