'mockingness' originates from English, specifically the adjective 'mocking' combined with the noun-forming suffix '-ness', where 'mock' meant 'to ridicule' and the suffix '-ness' meant 'state or quality'.

'mockingness' developed from the base verb 'mock' (attested in Middle English and influenced by Old French 'moquer'), formed as the adjective 'mocking' plus the suffix '-ness' (from Old English '-nes(s)e'), and eventually yielded the modern English noun 'mockingness'.

Initially associated with the verb sense 'to deride or ridicule'; over time the formation produced a noun meaning 'the state or quality of being mocking', a nominalization rather than a shift in core sense.