A negative personality trait. The name of it is derived from the concept of heat sink (an object which absorbs heat. A cluesink is a person who, in a conversation, will actually deprive others of clue. This person stands in opposition to those who would impart clue to the clueless, absorbing it as fast as it is imparted.

A cluesink will often ask questions which seem reasonable at first blush, but simply serve to confuse the issue.

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