How do you say "nineteen" in Japanese?

十九 is romanised as jūku. Say it roughly like "joo-koo" in English. Each Japanese syllable has even weight, so keep the rhythm steady.

十九 is a neutral, everyday word that works in both casual and polite speech. The level of formality comes from the sentence structure around it, not from the word itself.

十九 is written using kanji. 十九 combines ten (十) with nine (九), completing the teen numbers.

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