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Dunderhead
Definition: The first person to approach you privately - and say confidential things about the social group you have just joined for the first time - is almost invariably that group's dunderhead who is eager to make interpersonal inroads with someone who doesn't yet realize it.
See also: oddball, black sheep, misfit, weirdo etc.
Exquisite
Definition: extremely beautiful and, typically, delicate
Exception: in the expression "exquisite banter", the use of the word "exquisite" is an example of antonymic ironicism.