Here's another good word to add to the everyday vocabulary. Indefatigable. It's a big word with a relatively simple meaning -- "untiring" or "not able to be tired out." It's especially appropriate to use in reference to God in Isaiah 40:28.
Have you not known? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable. (ESV)
Use the word at parties, impress your friends, look smarter. You know, the everyday benefits of a graduate education.