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Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

 

I helped him cheat his way through college, which eventuated in being counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, double-edged, or the phrase work against someone, might fit the bill.

I helped him cheat his way through college; now he has no job. I did him a double-edged favor.

 

I helped him cheat his way through college, which eventually worked against him, since now he has no job.

Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

I helped him cheat his way through college, which eventuated in being counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, double-edged, or the phrase work against someone, might fit the bill.

I helped him cheat his way through college; now he has no job. I did him a double-edged favor.

I helped him cheat his way through college, which eventually worked against him, since now he has no job.

Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

I helped him cheat his way through college, which turned out to be counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, double-edged, or the phrase work against someone, might fit the bill.

I helped him cheat his way through college; now he has no job. I did him a double-edged favor.

I helped him cheat his way through college, which eventually worked against him, since now he has no job.

Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

I helped him cheat his way through college, which eventuated in being counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, double-edged, or the phrase work against someone, might fit the bill.

I helped him cheat his way through college; now he has no job. I did him a double-edged favor.

I helped him cheat his way through college, which eventually worked against him, since now he has no job.

Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

I helped him cheat his way through college, which turned out to be counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, the phrase work against someone might fit the bill.

I helped him cheat his way through college, which eventually worked against him, since now he has no job.

Consider counterproductive and detrimental.

counterproductive: thwarting the achievement of an intended goal; tending to defeat one's purpose Random House

I helped him cheat his way through college, which turned out to be counterproductive, since now he has no job.

detrimental: causing loss or injury; harmful; damaging Random House

Alternately, double-edged, or the phrase work against someone, might fit the bill.

I helped him cheat his way through college; now he has no job. I did him a double-edged favor.

I helped him cheat his way through college, which eventually worked against him, since now he has no job.