The philosophical position that deities do not exist. It is a form of explicit atheism, meaning that it consciously rejects theism. Some strong atheists also claim that the existence of any and all gods is logically impossible. Also called positive atheism, hard atheism and gnostic atheism. It should be noted that a strong atheist also fits the definition of a weak atheist, but that the reverse is not necessarily true: a strong atheist believes there is a lack or absence of evidence for justifying a belief in God or gods, but a weak atheist does not necessarily deny the possibility of God or god(s) existence.