The word "mundane" describes things that are ordinary and not special or exciting.
Think about your daily routine: waking up at the same time every morning, going to work or school, eating the same foods for breakfast, lunch, and dinner. That's a pretty mundane life - nothing out of the ordinary happens on a regular basis. You might use the word "mundane" when describing your job, saying something like, "I'm so tired of doing the same tasks every day, it's just so mundane." Or you might describe a task that you find boring or tedious as "mundane".
Worldly, earthly, profane, vulgar as opposed to heavenly.
