Boredom is an emotion

Emotion

Emotion is a complex psychophysiological experience of an individual's state of mind as interacting with biochemical and environmental influences. In humans, emotion fundamentally involves "physiological arousal, expressive behaviors, and conscious experience." Emotion is associated with mood,...

al state experienced when an individual is without any activity or is not interested in their surroundings. The first recorded use of the word boredom is in the novel Bleak House

Bleak House

Bleak House is the ninth novel by Charles Dickens, published in twenty monthly installments between March 1852 and September 1853. It is held to be one of Dickens's finest novels, containing one of the most vast, complex and engaging arrays of minor characters and sub-plots in his entire canon...

 by Charles Dickens

Charles Dickens

Charles John Huffam Dickens was an English novelist, generally considered the greatest of the Victorian period. Dickens enjoyed a wider popularity and fame than had any previous author during his lifetime, and he remains popular, having been responsible for some of English literature's most iconic...

, written in 1852, in which it appears six times, although the expression to be a bore had been used in the sense of "to be tiresome or dull" since 1768. The French term for boredom, ennui, is sometimes used in English as well.
Boredom has been defined by C.