Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: , past participle of abstrudere 'to hide', from abs- 'away' + trudere 'to push'

abstruse

 adjective
     
ab‧struse formal
unnecessarily complicated and difficult to understand:
Maths is a mix of abstruse theory and detailed calculations.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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