slow of understanding; wanting readiness of apprehension; stupid; doltish; blockish.-slow in action; sluggish; unready; awkward.-insensible; unfeeling.-not keen in edge or point; lacking sharpness; blunt.-not bright or clear to the eye; wanting in liveliness of color or luster; not vivid; obscure; dim; as, a dull fire or lamp; a dull red or yellow; a dull mirror.-heavy; gross; cloggy; insensible; spiritless; lifeless; inert.-furnishing little delight, spirit, or variety; uninteresting; tedious; cheerless; gloomy; melancholy; depressing; as, a dull story or sermon; a dull occupation or period; hence, cloudy; overcast; as, a dull day.-to deprive of sharpness of edge or point.-to make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.-to render dim or obscure; to sully; to tarnish.-to deprive of liveliness or activity; to render heavy; to make inert; to depress; to weary; to sadden.-to become dull or stupid.