Something that appears open to light and observation is said to be clear.

Disgusting dirt or garbage is also called filth. 

To attack something with heavy artillery is to bombard it.

Something that is very puzzling to you may make you feel bewildered about it.

When a large number of troops gather to protect a structure, this is a garrison of troops. 

When you arrive before everyone else to prevent distractions, you are said to arrive early. 

Something that is in the middle between two points is the central point.

Someone who is kind and pleasant is also called gracious.

From thoughts to ideas to a physical product is to conceive it.

Your general level of physical health is said to be called your fitness level.