He has already been blamed for his party's lackluster performance during the election campaign.他的政党在竞选活动中表现平平，他因此已受到指责。Your lackluster performance in the play really disappoints me.你在戏里了无生气的表演真让我失望。His writing can be lackluster at times.他的作品有时候也可能很乏味。