noun
a concept or idea not associated with any specific instance
adjective
existing in thought or as an idea but not having a physical or concrete existence
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The concept was too abstruse for most of the students to grasp.
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I find abstract art to be too abstruse for my taste.
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I can't understand this abstr stuff, it's too complicated.
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Her mind was like an abstr puzzle, always challenging to decipher.