Strong atheist

Strong atheism is in contrast to weak atheism, in which the atheist does not believe in any particular gods but does not deny the theoretical possibility of their existence, and theism, in which the theist asserts that there is at least one god of some kind. Strong atheism is almost always irreconcilable with agnosticism. The terms atheist and atheism are usually, but not always, used to indicate "strong atheism".

The difference between "strong" and "weak" atheism might be summed up as follows: strong atheism is the belief in the lack of any god, while weak atheism is the lack of belief in any god.