Deus otiosus or "idle god" is a theological concept used to describe a creator god who largely retires from the world and is no longer involved in its daily operation, a central tenet of Deism. A similar concept is that of the deus absconditus or "hidden god" of Thomas Aquinas (1225-1274).
Although Aquinas was a Catholic and not a deist, both his concept of the "hidden god" and the concept of the "idle god" refer to a deity whose existence is not readily knowable by humans solely through contemplation or through the examination of divine actions. The concept of deus otiosus often suggests a god who has grown weary from involvement in this world and who has been replaced by younger, more active gods, whereas deus absconditus suggests a god who has consciously left this world to hide elsewhere.
Read more about Deus Otiosus: Examples