1. inadequate or unsatisfactory execution or accomplishment of a task, job, or activity
The athlete's poor performance in the competition disappointed the fans.
O desempenho ruim do atleta na competição decepcionou os fãs.
2. substandard results or outcomes in work, academics, or other endeavors
His poor performance at school led to parental concern.
Seu desempenho ruim na escola causou preocupação dos pais.