We obviously write differently for different people. Here is where I found a great list of words that should never be used in an essay. Here are some other words I was taught never to use:
Obviously/clearly--if it's obvious or clear, you shouldn't have to explain it.
Because (at the beginning of a sentence)
In conclusion--this says that everything that follows is something you've already read
I/me/anything in first person unless the prompt specifically asks for something about you
?--you're supposed to answer questions, not pose more.