How to say "in vain, for nothing" in Russian?

Зря

"in vain, for nothing" is Зря in Russian.

Зря means "in vain, for nothing" in English.

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Word #2175 of 4,000 by frequency in Russian — level B2.

Example

Мы зря ждали его целый час.

We waited for him for an hour in vain.