Tsundoku
tsoon-DOH-koo
The Japanese word for acquiring books and letting them pile up without reading them. A combination of 'tsunde' (to pile up) and 'oku' (to leave for a while).
Origin
From Japanese 積ん読. First coined in the Meiji era (1868–1912) as a play on words: 'tsundoku' sounds like 'tsunde oku' (to pile things up and leave them) but replaces 'oku' with 'doku' (to read). The term was originally a gentle self-deprecating joke among Japanese readers.
In context
She had a serious case of tsundoku — the stack on her nightstand was taller than the lamp.
His tsundoku habit meant the spare room had become more library than guest room.
Every book lover knows the feeling of tsundoku, even if they didn't know there was a word for it.
Did you know?
The term dates back to at least 1879, when it appeared in a Japanese text by Mori Senzo. Despite being over 140 years old, it only entered widespread English usage in the 2010s, after being featured in a BBC article about untranslatable words.
Everyone who loves books accumulates them faster than they can read them. Tsundoku names that universal experience — the growing pile of unread books that sits on your shelf, your nightstand, your floor, silently judging you every time you buy another one.
But tsundoku isn't really about guilt. In Japanese culture, the word carries a gentle humor — an acknowledgment that books have value beyond being read. The pile itself is meaningful. It represents your curiosity, your aspirations, what you want to learn and who you want to become. An unread book isn't a failure; it's a promise.
The writer and philosopher Umberto Eco kept a library of 30,000 books. He hadn't read most of them. He called the unread portion his "anti-library" — a reminder of everything he didn't know. The unread books were more important than the read ones, because they represented the vastness of what was left to explore.
This doesn't mean you should buy books without limits. Tsundoku becomes a problem when the pile grows faster than your ability or willingness to engage with it — when buying books becomes a substitute for reading them. The antidote isn't to stop buying (good luck with that), but to be honest about the pile. Know what's in it. Browse it before you browse a bookshop. Read from it before you order something new.
A book catalog helps. When you can see every unread book you own in one place, the pile stops being abstract and becomes a personal bookshop you've already paid for. That shift — from guilt to browsing — is what turns tsundoku from a problem into a pleasure.