noun
a person's work or effort
preposition
used in the phrase 'in vain' to indicate that something is done without success or result
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Despite their best efforts, the team realized they were laboring in vain as the project deadline approached.
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I spent hours trying to fix my computer, but it seems like I was laboring in vain.
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I thought I could convince her to change her mind, but I was just laboring in vain.
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His attempts to win her back were like laboring in vain, as she had already moved on.