When something is uninspiring, it's not very interesting or exciting. The movie was uninspiring, and I didn't feel very interested in it.
The limbic system is a part of the brain that is responsible for emotions and instincts. It's also the part of the brain that is most active during sleep.
Laggards are people who are not very active or committed. They are usually the last people to join a group, or the first to leave a group.
To plummet is to fall quickly and suddenly. When the stock market crashed, the prices of all the stocks fell very quickly.
To memorize something is to remember it very well. You might memorize the capitals of the countries in the world, or the order of the planets.
To rewind something is to go back to a previous point in time. When you rewind a videotape, you are able to watch it again from the beginning.