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.

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.

To deprive of sharpness of edge or point.

Heavy; gross; cloggy; insensible; spiritless; lifeless;
inert.

Not keen in edge or point; lacking sharpness; blunt.

Slow in action; sluggish; unready; awkward.

Slow of understanding; wanting readiness of
apprehension; stupid; doltish; blockish.

Insensible; unfeeling.

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.