If you are a manager what is the best way to communicate to a team member that their behaviour is appalling without sounding rude?

Trying to find effective ways to communicate with team members

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1 on 1 in my office.Explain the issue clearly and that you expect a change in their behavior . Perhaps they are stressed and this is how they show it.I would support and guide to resolve this.
If there is no good reason for their behaviour explain that they could be disiplined for it.