中二病
ちゅうにびょう
chuunibyou
= ‘eighth-grader syndrome’; teenage delusions of being special or edgy
中二病 is the affectionate name for that phase, usually around the second year of middle school, when a kid suddenly acts impossibly cool, secretly believes they have hidden powers, or insists nobody understands them.
中二病, literally second-year-of-middle-school sickness, is mock-medical slang for the embarrassing self-important behavior typical of early adolescence. It covers trying too hard to seem mature or edgy, pretending to have special powers or a dark secret past, and a general conviction that one is uniquely deep or misunderstood. It is not a real illness but a humorous, often self-deprecating label, sometimes applied to adults who still act that way.
Use 中二病 playfully; calling someone 中二病 teases them for being cringe-y or pretentious, so it is fine among friends but can sting if meant seriously. It often describes past embarrassment (黒歴史, one’s dark history). The word also applies to adults clinging to teenage edginess, and anime fans use it for characters who strike dramatic, self-mythologizing poses.
中二 is short for 中学二年, the second year of middle school (around age fourteen), and 病 means sickness or disease. So 中二病 frames a developmental phase as a mock ailment, second-year syndrome. The 病 here works like English -itis used jokingly, naming a condition no doctor would diagnose, purely for comic effect.
Casual / Social Media
昔ノートに必殺技の名前を書いてたとか、完全に中二病だったな。
Mukashi nooto ni hissatsuwaza no namae wo kaiteta toka, kanzen ni chuunibyou datta na.
Writing the names of special finishing moves in my notebook back then, I was totally chuunibyou.
Everyday use
弟が急に黒い服ばかり着始めて、中二病が来たなと思った。
Otouto ga kyuu ni kuroi fuku bakari kihajimete, chuunibyou ga kita na to omotta.
My little brother suddenly started wearing only black, and I thought, here comes the chuunibyou phase.
Formal / Cultural context
中二病という言葉は、思春期特有の自意識を的確に言い表している。
Chuunibyou to iu kotoba wa, shishunki tokuyuu no jiishiki wo tekikaku ni iiarawashite iru.
The word chuunibyou aptly captures the self-consciousness peculiar to adolescence.
中二病 began as a comedic coinage on Japanese radio and spread through the internet, striking a chord because nearly everyone recognizes the phase in themselves or others. It gave a name to a universal awkward stretch of growing up, the moment a young teen reaches for an adult or heroic identity and overshoots into theatrical self-importance. Naming it turned shared embarrassment into a running joke.
Anime and manga embraced the concept enthusiastically, with whole stories built around characters who construct elaborate alter egos and imaginary powers. These works treat 中二病 with a mix of mockery and tenderness, acknowledging the loneliness and yearning underneath the posturing. That blend, laughing at the cringe while quietly sympathizing with it, is why the term has become such a fond fixture of Japanese youth culture.