Ietsism ( () – "somethingism") is an unspecified belief in an undetermined transcendent reality. It is a Dutch term for a range of beliefs held by people who, on the one hand, inwardly suspect – or indeed believe – that "there must be something undefined beyond the mundane and that which can be known or can be proven", but on the other hand do not necessarily accept or subscribe to the established belief system, dogma or view of the nature of a deity offered by any particular religion. Some related terms in English are agnostic theism (though many ietsists do not believe in one or more gods and are thus agnostic atheists), eclecticism, deism and spiritual but not religious.