'ritual-rejecting' originates from modern English, formed as a compound of 'ritual' + the present-participial form of 'reject' (rejecting). 'ritual' comes ultimately from Latin 'ritus' where 'ritus' meant 'ceremony', and 'reject' comes from Latin 'reicere' where 're-' meant 'back' and 'iacere' meant 'to throw'.

'ritual' passed into English via Medieval Latin 'ritualis' (from Latin 'ritus') and appeared in Middle English with the sense of formal ceremony; 'reject' derived from Latin 'reicere' and entered English through Old French/Latin influence as 'reject' (to throw back), with the -ing participle forming 'rejecting'. The compound 'ritual-rejecting' is a modern English formation combining these elements to describe opposition to ritual.

Individually, 'ritual' originally meant 'ceremony' and 'reject' originally meant 'to throw back'; combined in modern usage they mean 'opposing or refusing ceremonial practices.'