Disbelief in God can be expressed in various ways, often unique to each individual. Some alternative phrases and words to describe a lack of belief in God include atheism, agnosticism, skepticism, incredulity, and doubt. Atheism is the most commonly used term and refers to a complete rejection of the existence of a God or gods. Agnosticism refers to the belief that the existence of God cannot be proven or disproven, while skepticism and incredulity suggest a general distrust or doubt concerning the existence of God. Doubt is often regarded as a transitional phase towards disbelief, although some individuals may remain in a state of doubt indefinitely.