atheism (n.)youdaoicibaDictYouDict[atheism 词源字典]
1580s, from French athéisme (16c.), from Greek atheos "without god" (see atheist). A slightly earlier form is represented by atheonism (1530s) which is perhaps from Italian atheo "atheist." Ancient Greek atheotes meant "ungodliness."[atheism etymology, atheism origin, 英语词源]