He has been his own worst enemy for years.

She is being her own worst enemy by constantly doubting herself.

This is the worstest movie I have ever seen.

She is the worstest singer I have ever heard.

She performed worstly in the competition.

He is the worstestest player on the team.

My friend's last name is Worster.

The Worsters are coming to the party tonight.

My friend's last name is Worstell.

The Worstells are a well-known family in the town.