1. The quality or state of being heedless; lack of care, attention, or consideration
His heedlessness while driving caused the accident.
Sua desatenção enquanto dirigia causou o acidente.
2. Careless disregard for consequences or warnings
The heedlessness of the team's strategy led to their defeat.
A falta de cuidado na estratégia do time levou à sua derrota.