IPA: /ɪnˈdaɪtəbl/
KK: /ɪnˈdaɪtəbl/
Able to be formally accused of a crime in a court of law.
The lawyer explained that the actions of the suspect were indictable under the new law.
Indictable is formed from "indict" (from Latin "indictare", meaning to proclaim or announce) and the suffix "-able" (meaning capable of). The word "indictable" refers to something that is capable of being formally accused or charged with a crime.
Think of the word 'indict' which means to formally announce a charge, and remember that 'indictable' means something that can be formally charged.