This is the 13709th most frequent Turkish word.
kötüye
To the bad; toward the bad.
Here, 'kötüye' signifies using something in a malicious or harmful manner, abusing.
Bu fırsatı kötüye kullanmamalısın.
You should not abuse this opportunity.
In this sentence, 'kötüye' conveys leading someone towards a negative or harmful outcome.
O arkadaşlarını kötüye götürdü.
He led his friends into a bad situation.
Here, 'kötüye' indicates a movement or change towards a worse or unfavorable state.