A pleonasm is a redundant description. It is describing a word using adjectives that apply to it's inherent characteristics.
Person 1: Tim is a stupid idiot.
Person 2: As opposed to a smart idiot? You just used a pleonasm.
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Unusual ghostlike creature who frequents outhouses and continues to repeat the same word.
Jake heard the pleonasm through the half moon in the door, the night the comet struck.
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the use of more words than those necessary to denote mere sense : redundancy
Instead of getting straight to the central idea, she used pleonasm because she thought more words made it better