Dullness may refer to:

In vision

*A lack of perceived

brightness Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. In other words, brightness is the perception elicited by the luminance of a visual target. The perception is not linear to luminance, ...

*A lack of perceived

colorfulness Colorfulness, chroma and saturation are attributes of perceived color relating to chromatic intensity. As defined formally by the International Commission on Illumination (CIE) they respectively describe three different aspects of chromatic ...

In medicine

*A dull sound in response to

percussion (medicine) Percussion is a technique of clinical examination. Overview Percussion is a method of tapping on a surface to determine the underlying structures, and is used in clinical examinations to assess the condition of the thorax or abdomen. It is one of ...

** Shifting dullness, a medical sign

In philosophy and religion

Tamas (philosophy) Tamas (Sanskrit: तमस् ''tamas'' "darkness") is one of the three Gunas (tendencies, qualities, attributes), a philosophical and psychological concept developed by the Samkhya school of Hindu philosophy.James G. Lochtefeld, Guna, in The Illu ...

, one of the three tendencies in the Samkhya school of Hindu philosophy *

Thīna Thīna ( Sanskrit styāna, स्त्यान; pi, थीन) is a Buddhist term that is translated as "sloth". ''Thīna'' is defined as sluggishness or dullness of mind, characterized by a lack of driving power. In the Theravada tradition, ...

, an unwholesome mental factor in Buddhism *''Laya'' or ''bying-ba'', in the

five faults and eight antidotes The five faults and eight antidotes are factors of samatha meditation identified in the Tibetan Buddhist tradition. The five faults identify obstacles to meditation practice, and the eight antidotes are applied to overcome the five faults. This syst ...

of Tibetan Buddhism

Other uses

* Dulling, the tendency of a blade to lose sharpness *

Stupidity Stupidity is a lack of intelligence, understanding, reason, or wit. It may be innate, assumed or reactive. The word ''stupid'' comes from the Latin word ''stupere''. Stupid characters are often used for comedy in fictional stories. Walter B. ...

*A tendency to cause

boredom In conventional usage, boredom, ennui, or tedium is an emotional and occasionally psychological state experienced when an individual is left without anything in particular to do, is listlessness and dissatisfaction arising from a lack of occup ...

Drowsiness Somnolence (alternatively sleepiness or drowsiness) is a state of strong desire for sleep, or sleeping for unusually long periods (compare hypersomnia). It has distinct meanings and causes. It can refer to the usual state preceding falling asle ...

(archaic)

In vision

In medicine

In philosophy and religion

Other uses

See also