Definition of irreligious adjective from the Oxford Advanced Learner's Dictionary

 

irreligious

 adjective
adjective
BrE BrE//ˌɪrɪˈlɪdʒəs//
 
; NAmE NAmE//ˌɪrɪˈlɪdʒəs//
 
(formal)
 
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without any religious belief; showing no respect for religion Word Origin late Middle English: from Latin irreligiosus, from in- ‘not’ + religiosus (from religio ‘reverence, obligation’, perhaps based on Latin religare ‘to bind’).
See the Oxford Advanced American Dictionary entry: irreligious