The grounds for an annulment are:
- One of the parties was already married to someone else when the marriage took place
- Not consummating the marriage due to incapacity
-
Mental illness that makes the person not fit for marriage
- The spouse is pregnant by another man
这个比离婚要彻底，因为annulment的法律效应是把结婚状态打回到这段无效婚姻之前，也就是说在法律意义上，这段婚姻从来没有发生过。如果你这段婚姻之前没有结过婚的话，那你在法律上就是Single, Never Married!
An annulment is a legal procedure to dissolve a marriage, declaring it
null and void. However, unlike divorce proceedings, an annulment works
on the basis that the marriage never properly existed in the first
place.
(http://www.singaporedivorcelawyer.com.sg/annulment/)
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