Latin iners

← Proto-Indo-European *h₂er- (root)

← Proto-Italic *enartis (inherited)

→ English inertia (mention)

→ English inert (mention)

→ Catalan inert (derived)

→ Spanish inerte (derived)

→ French inerte (borrowed)

→ French inertie (mention)

→ Galician inerte (derived)

→ Italian inerte (derived)

→ Latin inertia (mention)

→ Portuguese inerte (derived)

→ Romanian inert (derived)