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

conduta desonrosa

substantivo

full

unreasonable conduct

noun

Definitions of unreasonable conduct

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.

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

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