pig-ignorant 
adjective informal
Extremely stupid or crude.You truly are a pig-ignorant, foul-mouthed, drivelling half-wit....
- Also, as the flatmate in question is Italian, my pig-ignorant English-speaker status was not an undue encumbrance as his friends were used to speaking to him in English.
- The man persists in writing about the Middle East when he is pig-ignorant on the subject, and he is shameless in distorting reporting he doesn't approve of.