To deprive of sharpness of edge or point.

To render dim or obscure; to sully; to tarnish.

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

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.

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.

Insensible; unfeeling.

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

s. donuk, sönük; kör, kesmez; tatsız, yavan; anlayışsız. You can’t cut anything with that dull knife. (O kör bıçakla hiçbir şey kesemezsin.)

Slow in action; sluggish; unready; awkward.

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