'voidability' originates from Modern English, specifically formed from the adjective 'voidable' plus the Latinate suffix '-ity', where the suffix '-ity' meant 'state or quality'.; 'voidable' originates from Middle English/Modern English formation, specifically from 'void' + the suffix '-able', where '-able' meant 'capable of'.; 'void' originates from Old French, specifically the word 'vuid'/'void', where the root came from Latin 'vacare' meaning 'to be empty'.

'voidability' was created by adding the noun-forming suffix '-ity' to 'voidable' in legal and formal English to denote the state or quality of being voidable. ; 'voidable' developed from 'void' + '-able' in Middle English and was used in legal contexts to mean 'capable of being voided'. ; The Old French 'vuid' (later 'void') derived from Latin 'vacare' passed into Middle English as 'void' and then into modern English with senses including 'empty' and, in legal use, 'null or invalid'.

Initially, the components expressed 'the state/quality of being capable of being voided'; over time the compound came to be used specifically in legal contexts to mean 'the capacity or susceptibility of a legal instrument to be declared void'.; Initially, 'voidable' simply meant 'capable of being voided' and was used broadly; it became specialized in legal usage to refer to contracts or acts that may be avoided. ; 'Void' originally meant 'empty' (from Latin 'vacare'); over time it gained extended senses such as 'null' or 'without legal force', which produced derivatives like 'voidable' and 'voidability'.