Massachusetts, U.S. English - U.S. First, "firstly" and "secondly" are not words. They are sometimes used in informal speech, but I would try to avoid them there and would not use them at all in writing.

Does firstly have to be followed by secondly?

3 Answers. First doesn't have to be followed by second (or firstly by secondly), in that it is logical to state something comes first and let it be inferred that something else is second.

What can I use instead of Firstly Secondly Thirdly?

Re: Is there any alternative to "First, Secondly,thirdly..."? "Last but not least" is used quite commonly. It sums up a list, and re-inforces the importance of all of the points. "Last but definitely not least" may also be used.