'anticeremoniousness' originates from English, specifically from the adjective 'anticeremonious' plus the suffix '-ness', where the prefix 'anti-' ultimately comes from Greek 'anti-' meaning 'against', and 'ceremonious' traces back to Latin 'caerimonia' (via Old French 'ceremonie') meaning 'ceremony'.

'anticeremonious' was formed in modern English by combining the prefix 'anti-' with the adjective 'ceremonious' (which itself evolved from Latin 'caerimonia' through Old French 'ceremonie'), and the noun 'anticeremoniousness' later arose by adding the nominalizing suffix '-ness'.

Initially the components conveyed 'against ceremony' or 'not ceremonious'; over time the combined adjective and its noun form have come to mean 'the state or quality of being informal or unceremonious', a meaning that has remained largely consistent.