Late 15th century (in an earlier sense). Either from inform + -able, or from classical Latin informāre in the post-classical Latin sense ‘to give information’ + -ble.
Definition of informable in US English:
informable
adjectiveɪnˈfɔːməbl
Capable of being informed. rare before 20th cent.
Origin
Late 15th century (in an earlier sense). Either from inform + -able, or from classical Latin informāre in the post-classical Latin sense ‘to give information’ + -ble.