'carpingness' originates from Modern English, specifically formed from the adjective 'carping' (itself from the verb 'carp') plus the noun-forming suffix '-ness'.

'carping' (adjective) developed from the verb 'carp', which in Middle English appeared as 'carpen' meaning 'to complain or find fault'. That Middle English verb was influenced by earlier northern and continental Germanic forms (cf. Old Norse 'karpa') and related Romance words (cf. Old French 'carper'), and eventually the modern English noun 'carpingness' was formed.

Initially the root 'carp' meant 'to complain or find fault'; over time the derived forms came to denote the characteristic or quality of making such complaints, hence 'carpingness' meaning 'the tendency to be carping'.