dullest
adjective
Definitions
Lacking the ability to cut easily; not sharp.
Example: All these knives are dull.
Boring; not exciting or interesting.
Example: He sat through the dull lecture and barely stayed awake.
Not shiny; having a matte finish or no particular luster or brightness.
Example: Choose a dull finish to hide fingerprints.
Not bright or intelligent; stupid; having slow understanding.