There are multiple definitions - click on the translation that matches your context.

conduta desonrosa

substantivo

full

unreasonable conduct

noun

Definitions of unreasonable conduct

English

bad behaviour by a spouse (=the person you are married to) that shows that the marriage has broken down and cannot be saved eg adultery

His wife had sought a divorce on the grounds of unreasonable conduct.

English

behaviour that is not as good as the minimum accepted usual standard

The tribunal concluded that not telling the truth is unreasonable conduct.