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Difficult to understand; recondite: The students avoided the professor's abstruse lectures.
[Latin abstrūsus, past participle of abstrūdere, to hide : abs-, ab-, away; see ab-1 + trūdere, to push; see treud- in Indo-European roots.]
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|Adv.||1.||abstrusely - in a manner difficult to understand; "the professor's abstrusely reasoned theories were wasted on his students"|