What are better words to use in an article than "obvious"? I've heard often than it is ill-form to use the word "obvious" in a research paper. I was hoping to gather a list of less offensive words that mean generally the same thing. 
For example, one that I can think of is the word "direct". 
So instead of saying "...obviously follows from lemma 2.3..." you'd say "...this proof directly follows from lemma 2.3...".

evidently, visibly, naturally, undeniably..
Words like trivially, and obviously sound disrespectful, it is as if the author is mocking the reader.
Also they sound 'empty' and many authors use these words to make up for the incompleteness in their work.  
Mathematics is about deduction, not intuition. So any word that does not imply to bring in intuition to reason can be thought of as a good word. :)
