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1.
A person who is in a state of unhappiness; usually unhappy with their current lifestyle. Can also represent an individualwho generally thinks everything sucks. Note the elderly woman reading a newspaper in Queen's 'I Want to Break Free' video for a clear example.
Everything sucks - random disgruntled person
by freddie January 05, 2005
 
2.
A grunting state of agitated displeasure assumed by egocentric engineer or sports types who are quite fond of getting their own way, by brain or by brawn, and find themselves powerless to get what they want. It is generally saved to manipulate lesser minds into capitulating to their will. Those who challenge them find this tactic pointless and extremely amusing.

“If I don’t get _________________ by five tonight, I am going to be extremely disgruntled.”

“I know you know this, but maybe you don't KNOW it know it...but ignoring me, or my emails, does NOT make things go away as if they never happened. It only serves to make me further disgruntled and unhappy.”
by Nebraska Wildcat September 25, 2008
 
3.
being both pissed off and startled and sad and confused at the same time; just an extreme of all three
my mom was DISGRUNTLED because dad left us on tuesday
by Tyler L. Davis II January 11, 2006
 
4.

A grunting state of agitated displeasure assumed by egocentric engineer or sports types who are quite fond of getting their own way, by brain or by brawn, and find themselves powerless to get what they want. It is generally saved to manipulate lesser minds into capitulating to their will. Those who challenge them find this tactic pointless and extremely amusing.

“If I don’t get _________________ by five tonight, I am going to be extremely disgruntled.”

“I know you know this, but maybe you don't KNOW it know it...but ignoring me, or my emails, does NOT make things go away as if they never happened. It only serves to make me further disgruntled and unhappy.”
by Nebraska Wildcat September 29, 2008