dull

US /dʌl/

UK /dʌl/

A2
adj.AdjectiveNot exciting or interesting; boring; lifeless
The class was so dull that most students chose not to attend
adj.AdjectiveBeing dim, not so bright and hard to see
Its quite dull outside
adj.AdjectiveNot sharp
This knife is so dull it cannot cut paper
v.t.Transitive VerbTo cause a thing to become less sharp/less bright
Years of use will certainly dull the edge of a knife
adj.AdjectiveNot shiny and bright
I could not see my face in the dull window
adj.AdjectiveBeing mentally slow
He's dull and stupid, don't bother talking to him
adj.AdjectiveBeing quiet or not clear
The photograph was dull, its colors were not clear

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