What does 引きこもり Hikikomori mean?

Hikikomori is prolonged withdrawal from social life: not leaving home, not attending school or work, and not maintaining relationships outside the household. It has a formal definition, which is unusual for a word on this site and is the reason the loose English usage is worth correcting.

The construction

引く (hiku) is to pull or draw back. 籠もる (komoru) is to shut oneself inside, and it is an old word, used of smoke filling a room and of a person secluding themselves in a temple. The compound describes a retreat inward rather than a personality.

The definition, which has a number in it

Japan's Ministry of Health, Labour and Welfare set out guidance in 2003, updated later, describing it as a psycho-sociological phenomenon rather than a single illness: withdrawal from social participation, remaining at home for more than six months, most often affecting people under thirty.

Later psychiatric work has converged on similar criteria, with marked isolation at home, a duration of at least six months, and significant distress or impairment attached to it. The six-month threshold is what separates the term from a description of temperament.

Why the loose usage misleads

English fandom applies the word to any character who prefers their room, which turns a documented condition into a personality label. A homebody is not this. Someone who works remotely and dislikes parties is not this. The word describes an extended cessation of social participation, usually accompanied by distress.

Not a Japanese phenomenon

The word is Japanese and the situation is not. Comparable cases have been identified in a number of countries, and the research literature has spent years treating it as an international rather than a national question.

That matters because the exoticised framing, in which this is a curiosity produced by uniquely Japanese pressures, is both inaccurate and convenient. It allows readers elsewhere to treat the subject as somebody else's, when the honest position is that Japan named it first and studied it earliest.

On using the word about a person

Japanese usage does apply it to people as well as to the condition, and Japanese commentary has argued about whether that is helpful, for the same reasons English has moved away from naming people after their diagnoses. Worth knowing before deploying it as a casual descriptor.