Synonyms for dullness

noun

1. Quality of being boring

   flatness, sameness, routine, uninterestingness, aridity, dryness, depression, dimness, drabness, tediousness, commonplaceness, mediocrity, tedium, monotony, deadliness, dreariness, insipidity, vapidity, staleness, lifelessness, tameness, familiarity; see also boredom, monotony, slowness 1.

   Antonyms action*, liveliness, interest.

2. Stupidity

   stupidness, insensibility, slow-wittedness; see stupidity 1.