insipid
Flat paint leaves a dull finish.
CARRIER
A dull surface is often referred to as matte or flat.
Flat, dull, insignificant .
dull
bland, dull, flat, weak
resonance, hyperresonance, flat, dull, typani
Table, butte
Dull objects are things that lack shine, luster, or sharpness. They typically have a flat or muted appearance, lacking in brightness or interest. Examples include dull knives, worn-out pencils, and faded fabrics.
Flat is the opposite of sharp, both musically andphysically. :)
Table ...
It can have that connotation, but the word montony means a dull, drab, or boring state, one caused by endless repetition of the same activity without change.The word monotone means a flat, droning, unchanging vocal style.