Translation guide
How to express 'largest' in Japanese, covering size, scale, and degree.
Describing the biggest physical object, area, or entity.
The most common and natural way to say 'largest' for physical size. Works in most contexts.
This room is the largest.
The largest lake in Japan is Lake Biwa.
More formal and often used in written language or technical contexts. Directly modifies a noun.
This is the largest airport in the world.
Literary or formal equivalent of 一番大きい. Less common in everyday speech.
The largest challenge is lack of funds.
Referring to the greatest amount, number, or proportion.
Expressing the greatest level of something abstract, like influence or importance.
一番 is the default for spoken Japanese. 最も is more formal and often used in writing or speeches. Both mean 'most' or '-est'.
largest
大きい refers to physical size. For numbers or amounts, use 多い (many/much) or 最大の (maximum). Saying 一番大きい数 sounds unnatural; use 一番多い数 or 最大数.