nullifidian noun & adjective. 
[nʌlɪ'fɪdɪǝn] M16.[from medieval Latin nullifidius, formed as NULLI- + fides faith: see -AN, -IAN.]A. noun.
1.  A person having no faith or religion, an atheist. 
M16.2.  gen. A disbeliever (
in something), a sceptic. 
M17.b. adjective. Having no faith or belief. 
M17.  [TahlilGaran] English Dictionary ▲