Most domestic violence includes emotional abuse, which can include such tactics such as:
The impact of emotional abuse may be even more devastating than physical assault - and have much longer term effects - yet most of the above behaviours are not crimes, and it's therefore much more difficult to obtain protection, or even to get others to take them seriously.
Reference: Women’s Aid website, http://www.womensaid.org.uk/domestic_violence_topic.asp?section=0001000100220042§ionTitle=Emotional+abuse