foggiest

(adjective)

adjective

1. superlative form of foggy: most foggy

- Moscow is the foggiest city I've ever been to.

2. (usually used in the negative) Very unclear; only slightly known; very difficult to understand or begin.

- I don't have the foggiest idea how to get to Piccadilly Circus on the Tube.

- She wasn't going to get the foggiest notion about modern writing from those old books.

- He asked me where she was going and I said 'I don't have the foggiest.'