noun
language that is meaningless or is made unintelligible by excessive use of technical terms
adjective
characterized by jargon or pretentious language that is difficult to understand
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The legal document was filled with so much gobbledygook that it was difficult to understand.
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I tried reading that scientific article, but it was full of gobbledygook.
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The instructions were written in total gobbledygook, I had no idea what to do.
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Her explanation was like gobbledygook to me, I couldn't make any sense of it.