Comey's Limited Vocabulary
Mr. Gowdy. Why is the appearance of bias as insidious as actual bias?
Mr. Comey. The appearance of bias is as important. I don't know exactly what the word "insidious" means, so I'm not saying that one.
https://thehill.com/homenews/house/420413-read-transcript-of-comeys-interview-before-house-lawmakers