'nonseizability' originates from Modern English, specifically the prefix 'non-' (from Latin 'non' meaning 'not') combined with 'seizability' (from Old French 'seisir' meaning 'to take possession') and the suffix '-ability' (from Latin '-abilitas' meaning 'capability').

'nonseizability' was formed in English by adding the negative prefix 'non-' to the existing noun 'seizability' (itself derived from the verb 'seize' < Old French 'seisir') to express the opposite quality; this produced the modern compound 'nonseizability'.

Initially, the components meant 'not' + 'ability to be seized'; over time the compound has come to be used specifically in legal and financial contexts to mean 'not subject to legal seizure'.