a boring evening with uninteresting people.
a dark day.
a dull gaze.
a dull glow.
a dull play.
a dull political campaign.
a dull sky.
a dull sky.
a dull throbbing.
a ho-hum speaker who couldn't capture their attention.
a large dull impassive man.
a sluggish market.
Age had dulled the surface.
although dull at classical learning, at mathematics he was uncommonly quick.
business is dull (or slow).
dull days with nothing to do.
dull greens and blues.
dull pain.
dull silver badly in need of a polish.
dumb officials make some really dumb decisions.
fell back into one of her dull moods.
he was either normally stupid or being deliberately obtuse.
he was so dull at parties.
his competent but dull performance.
how dull and dreary the world is.
Middle age dulled her appetite for travel.
muffled drums.
muted trumpets.
never met anyone quite so dim.
other people's dreams are dreadfully wearisome.
so dense he never understands anything I say to him.
so exhausted she was dull to what went on about her.
tedious days on the train.
the deadening effect of some routine tasks.
the dull boom of distant breaking waves.
the dull thud.
the knife was too dull to be of any use.
the muffled noises of the street.
The shock numbed her senses.
the sky was leaden and thick.
the tiresome chirping of a cricket.
the varnished table top dulled with time.
thudding bullets.
Too much cutting dulls the knife's edge.
what an irksome task the writing of long letters is.
worked with the slow students.