1dull 
/ˈdʌl/ adjective
dull·er; dull·est /ˈdʌl/ adjective 1 : not exciting or interesting : boring
▪ a dull lecture/speaker ▪ There's never a dull moment in our house. [=our house is always very busy or exciting] 2 : having an edge or point that is not sharp
▪ a dull [=blunt] knife ▪ a dull pencil 3 of a sound : not clear and loud
▪ the dull roar of the crowd ▪ He heard a dull [=muffled] thud. 4 of pain : constant but not sharp or severe
▪ She complained of a dull ache/pain in her knee. 5 : not shiny
▪ The paint has a dull finish. ▪ The dog had no appetite and its eyes were dull. 6 : not sunny : having a lot of clouds
▪ a dull winter sky 7 : slightly grayish or dark : not bright
▪ a dull light ▪ The sky was a dull blue. 8 old-fashioned : stupid or slow in understanding something
▪ a dull student 9 : not having a lot of business or financial activity
▪ a dull [=slow, sluggish] market
▪ a dull lecture/speaker ▪ There's never a dull moment in our house. [=our house is always very busy or exciting]
▪ a dull [=blunt] knife ▪ a dull pencil
▪ the dull roar of the crowd ▪ He heard a dull [=muffled] thud.
▪ She complained of a dull ache/pain in her knee.
▪ The paint has a dull finish. ▪ The dog had no appetite and its eyes were dull.
▪ a dull winter sky
▪ a dull light ▪ The sky was a dull blue.
▪ a dull student
▪ a dull [=slow, sluggish] market
(as) dull as dishwater — see dishwater
(as) dull as ditchwater — see ditchwater
— dull·ness noun [noncount]
▪ I couldn't get past the dullness of the book's topic.
▪ I couldn't get past the dullness of the book's topic.
— dul·ly adverb
▪ He sat staring dully into the distance.
▪ He sat staring dully into the distance.
