'appetizingness' originates from English, specifically formed from the adjective 'appetizing' plus the noun-forming suffix '-ness'; 'appetizing' comes from the verb 'appetize', which ultimately traces to Latin 'appetitus', where the elements 'ad-' meant 'to/toward' and 'petere' meant 'to seek' or 'to desire'.

'appetizingness' developed through a chain: Latin 'appetitus' -> Old French/Middle English forms relating to 'appetite' -> Modern English verb 'appetize' -> adjective 'appetizing' -> noun formation with '-ness' producing 'appetizingness'.

Initially the root sense in Latin related to 'desire' or 'seeking' (i.e., appetite); over time this evolved into English senses focused on appetite and the ability of food to stimulate desire to eat, now expressed by 'appetizingness' as the quality of being appetizing.