IPA: //ʌnˈprɪntəbl//
KK: /ʌnˈprɪntəbl/
Not suitable for publication due to being offensive or inappropriate.
The comedian's unprintable jokes were not allowed in the newspaper.
Unprintable → It is formed from "un-" (meaning not) and "printable" (from "print" which comes from Old French *preinte*, meaning to press or imprint, combined with the suffix "-able" meaning capable of). The word "unprintable" means not capable of being printed or unsuitable for printing.
Think of 'not' ('un-') being added to 'capable of being printed' ('printable') — that's why unprintable means something that cannot be printed.