1. Lowered to a stupid, silly, foolish, and childish level by some kind of drink. Can also signify contempt.
2. Stupified or intoxicated by something false and dangerous to the point where they put themselves in grave danger.
3. Someone who drinks like a fish.
4. Most people submitting definitions to Urban Dictionary.
He's so sottish he doesn't even realize how much danger he's putting us in!
The preacher and his congregation were made sottish with all of the false doctrines in the Christian church today.
That sottish man is really tempting fate with trying to wake up that fire-breathing dragon.