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• r  in a manner difficult to understand
  the professor's abstrusely reasoned theories were wasted on his students

• A blonde girl symbolizes death, but no more abstrusely than a headwaiter symbolizes dinner.
• Evidence for Chandrasekhar's picture of the primordial universe, published in the Astrophysical Journal, is abstrusely mathematical.
• That night he stayed up late chatting abstrusely.