'mislayable' originates from English, specifically the combination of 'mislay' + the adjectival suffix '-able' (from Latin 'abilis' via Old French), where the prefix 'mis-' meant 'wrongly' or 'badly' and 'lay' came from Old English 'lecgan' meaning 'to place'.

'mislay' was formed in Middle English from the prefix 'mis-' + 'lay' (Old English 'lecgan'); the suffix '-able' entered English via Old French and Latin ('-abilis') to form adjectives, producing 'mislayable' as a word meaning 'able to be mislaid'.

Initially the components conveyed 'placed wrongly' or 'placed badly'; over time the combined adjective came to mean 'capable of being misplaced' or 'easily lost', a meaning that has remained consistent in modern usage.