'assaultable' originates from English, specifically the word 'assault' plus the suffix '-able', where '-able' meant 'capable of or suitable for'.

'assault' changed from Old French 'assaut' and the verb 'assaillir' (to attack), ultimately from Latin 'assilire' (ad- + 'salire' meaning 'to leap'), and eventually became the modern English word 'assault'; 'assaultable' was formed in Modern English by adding '-able' to 'assault'.

Initially, the root meant 'to leap upon' (Latin), then developed the sense 'to attack' in Old French and Middle English; 'assaultable' later came to mean 'capable of being attacked'.