earthboundEnglishOxford Dictionary of Englishearthbound /ˈəːθbaʊnd / ▸ adjective 1 restricted to the earth: a flightless earthbound bird. 2 limited to material existence as distinct from a spiritual or heavenly one: her earthbound view of the sacrament. ▪ lacking in imaginative reach or drive: an earthbound performance. 3 moving towards the earth: an earthbound spaceship.