What Is A Synonym For Dull?

What Is A Synonym For Dull? adjective. boring, dreary, dumpy (informal), flat, frowzy, homely (US), humdrum, monotonous, plain, run-of-the-mill, tedious, uninteresting. stupid, dense, dim-witted (informal), dozy (British, informal), slow, thick, unintelligent. cloudy, dim, dismal, gloomy, leaden, overcast. What is the synonym and antonym of dull? dull. Synonyms: stupid, stolid, doltish, insensible, callous, heavy, gloomy, dismal,