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in vain
01
無駄に
without success or achieving the desired result
例
She waited for a response to her letter, but her hopes were in vain as no reply arrived.
He tried to convince them to change their decision, but his efforts were in vain, and the plan proceeded as initially intended.
The doctor worked tirelessly to save the patient, but unfortunately, all efforts proved to be in vain, and the patient could not be revived.
Despite hours of searching, the lost keys were found in vain, and she had to get a spare set.
The team struggled to score a goal, but all their attempts were in vain as the opposing defense remained impenetrable.
