〜じゃありません
Is not (negative of です)machine translation
FormationNoun + じゃありません
じゃありません is the negative form of です, meaning "is not." It goes right after a noun: 学生じゃありません — "is not a student."
じゃ is a contracted way of saying では, so in formal writing you'll see ではありません — the meaning is exactly the same. In conversation there's also the form じゃないです, a bit more casual but still polite.
Note: じゃありません is only for nouns and な-adjectives. い-adjectives negate in their own way (〜くないです), which you'll learn in the adjectives section.
Examples
私は医者じゃありません。
I am not a doctor.
これは水じゃありません。
This is not water.
今日は休みじゃありません。
Today is not a day off.