Cluster B

n. Being defined as an illness in the psychiatric manual DSM IV.

e.g. The man describing his suffering from everyday "boredom", experiencing mostly (very) high and (very) low emotions was classified by his psychiatrist as typical Cluster B.

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cluster B personality types

cluster B personality types include narcissism, borderline personality disorder, antisocial personality disorder, histrionic personality disorder, etc. Impulsive and unpredictable personalities, as opposed to cluster A and C personalities, which tend to be odd and eccentric (A), or anxious and scared (C). In my opinion, the most dangerous personality disorders are probably cluster B.

Person A: "Did you see Cory? He faked a broken leg for attention, he's been moaning and groaning about it all day long, but, he's actually perfectly fine!"
Person B: He always acts out like this for attention and disrupts his classmates. The school psychologist said he could have a cluster B personality disorder, like histrionic personality disorder.
Person A: "I heard that cluster B personality types tend to be described as impulsive and unpredictable in the DSM 5. "
Person B: "Yep, I hope he grows out of it."