The phrase "dull face" is correct and usable in written English.
You can use this phrase to describe someone's facial expression when they have a lack of emotion or enthusiasm. For example, "His dull face showed no sign of excitement as he opened his birthday present."
What a sad day for America, what a dull face to show the world.
Dickens recognized, even with the very first modern clown, that what fascinates us is not the exaggerated painted face, or the dull face of a man underneath.
It was anything but boring and dull: Face the Music and A New World Record eschewed the orchestrated prog of Eldorado and explored the Beatles influence even further, with the pure pop perfection of Telephone Line and hit Evil Woman (which directly references the Fabs with the line "there is a hole in my head where the rain comes in", a magpie lyric snatched from Fixing a Hole).
He wrote in 1996 that the example of Cezanne "helps me to dare to follow my most awkward, foolish passions and obsessions, to wave my own red flags in the dull faces of late-century salon hacks and killers".
Make sure that the ribbon is still facing dull side down.
The dull side will need to face downwards, towards the ground, when you're curling the ribbon with scissors.
Each time, she has been overshadowed and upstaged, cast as the dull, plodding face of continuity against the unexpected harbinger of change.
We even saw an apparently dull rock face light up with shades of rose and russet as we paddled out of the daylight and into Cathedral Cave, dodging the sharp black rocks that jutted out like giant teeth.
But when the lady leaned into the car for the first time, all she offered was a dull, officious face as she told them they'd have to wait another half hour, at least, for the cleanup crew to finish sweeping off the mountain road ahead, and then she returned to her spot and stood holding the sign.
Staring straight into the camera, a dulled look on his face, Trump admitted that he had "said and done things I regret and the words released today on this more than decade-old video are one of them,".
We existed in a state of hyperawareness and we had dull, thoughtless faces.
