Dull is used with these nouns as the subject:
eye

Dull is used with these nouns as the object:
appetite, mind, pain, sense

appear, be, look, seem, sound
become, get
The work gets a little dull at times.

make sth
The long lectures made the afternoon dull.

find sth

extremely, fairly, very, etc.
deadly, dreadfully (esp. BrE), incredibly, mind-numbingly
The movie was long and deadly dull.

a little, slightly, etc.
disappointingly

Dull is used with these nouns:
ache, blade, brown, child, colour, complexion, existence, eye, gleam, glow, hair, headache, knife, metal, murmur, pain, red, roar, routine, rumble, sky, throb, thud, thump