1. The property of matter by which it remains at rest or in uniform motion unless acted upon by an external force (physics).
Newton's first law describes the principle of inertia.
A primeira lei de Newton descreve o princípio da inércia.
2. Lack of energy, motivation, or initiative; sluggishness or passivity.
His inertia prevented him from pursuing his dreams.
Sua inércia o impediu de perseguir seus sonhos.
3. Resistance to change or innovation in systems, organizations, or customs.
The company struggled against the inertia of old business practices.
A empresa lutou contra a inércia das práticas comerciais antigas.