sharpness
Answer:
Alert and active
dullness is how bright a color is, eg dull is very un-bright
Dullness in reference to IQ generally indicates lower intellectual abilities, often characterized by difficulty in learning and problem-solving compared to the general population. It may also be associated with slower cognitive processing and challenges in adapting to new information or tasks.
Some words that rhyme with "dullness" are fullness, sullenness, and mulishness.
The dullness of the day was very depressing compared to the sunshine they had last week.
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
Dullness
Dullness
Constantly uninteresting
intensity
Dullness
The closest you can get to it is just 'dullness'
the antonym is dullness and spirtlessness.