The noun forms for the verb admonish are admonisher, admonition, and the gerund, admonishing.

An antonym for 'Admonish' might be 'Praise'.

Admonish is to reprimand someone.

Parents should admonish their children to do good deeds.

The judge will admonish the jurors before the trial starts.

The mother will admonish her children to eat a lot of vegetables.

The verb form of "admonition" is "admonish." It means to admonish or reprimand someone, usually for their behavior or actions, in a strict or serious manner.