Synonyms of 'dullness'
1 (noun) the dullness of their routine life
2 (noun) his dullness of mind
stupidity, , , , , ,
I stared at him, astonished by his stupidity.
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in the sense of banality
the banality of life
in the sense of flatness
He detected a certain flatness in the days that followed.
Thesaurus for dullness from the Collins English Thesaurus