Worrisome means dangerous or unpleasant. When you say that something is worryingly high, you are saying that the number is high enough to be alarming.
To littered is to scatter something all over the place. When you littered your room with clothes, you scattered them all over the floor.
To proof something is to test it to make sure that it is correct. You might proof a document to make sure that it is error-free.
When it rains, the streets get flooded and the pavement turns into a muddy mess. To fix this problem, the city usually needs to pave the streets.
A resourceful person is able to find a way to solve problems or manage difficult situations. They are usually very creative and able to think outside the box.
To meander is to wander aimlessly. You might meander through the park, or you might meander through your thoughts.
To dash is to run quickly and energetically. When you dash through a door, you're trying to get out of the room as fast as possible.
To be nauseous is to feel very sick and uncomfortable. You might be nauseous because you ate something that you shouldn't have, or you might be nauseous because you're feeling sick from the flu.
When something is diagonally opposed, it is in a position that is opposite to the other two directions. For example, if you are facing north, your right side is diagonally opposed to your left side and your front side is diagonally opposed to your back side.