Immorality is wrong or bad moral behaviour. It is living in a way that goes against the way society says life should be lived. Governments create laws by which its citizens are supposed to live, for the purpose of maintaining order, civility and peace. Communities function best when they operate according to the moral code of the land.
Immorality as it relates to God is what destroys the relationship you have with Him. This is what is referred to as sin: breaking God’s laws. It becomes a barrier between you and Him and will ultimately result in you being rejected by Him if it is never corrected.