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1.
1) A disease somewhat like liberalism
2) A rage similar to that felt by Macho Man Randy Savage
3) The defining aspect of the realm
Officer Joe is pissed off for no reason. He has stepped into the realm of bitterness
by The J men May 23, 2005
 
2.
A feeling of deep anger and resentment. Bitterness is an emotion which encompasses both anger and hate, often people who are bitter appear to the world as just going around pissed off at everyone and everything. However bitterness is often a result of some past event which has hurt, scarred and jaded the person.
Mary let her bitterness she felt towards her family consume her.
by OneBadAsp November 03, 2006
 
3.
A very unattractive character in any person who feels the need to their emotions out on people who are usually just honest.
hard to admit or accept: a bitter lesson
He showed a lot of bitterness after their break-up
by I'm Real Loser September 21, 2010