1. to be impolite, rude, or disrespectful; to behave without proper etiquette or social courtesy
He lacks manners and often interrupts people during conversations.
Ele tem falta de educação e frequentemente interrompe as pessoas durante conversas.
2. to demonstrate absence of good breeding, refinement, or courtesy in behavior
She lacks manners when speaking to her elders.
Ela não tem educação ao falar com seus idosos.