IPA: /pəˈvɜːs/
KK: /pɚˈvɜrs/
Having a tendency to behave in a way that is unreasonable or contrary to what is expected; often stubbornly wrong or difficult.
His perverse sense of humor often offended others.
Perverse → It is formed from "per-" (meaning through or thoroughly) and "vertere" (meaning to turn). The word describes something that is turned away from what is right or good, hence morally wrong or corrupt.
Think of something that is 'thoroughly turned' away from what is right — that's why perverse means morally wrong or corrupt.