abstruse

difficult to comprehend obscure 
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abstruse

[adj] - difficult to penetrate
Found on http://www.webdictionary.co.uk/definition.php?query=abstruse

Abstruse

Ab·struse' adjective [ Latin abstrusus , past participle of abstrudere to thrust away, conceal; ab , abs + trudere to thrust; confer French abstrus . See Threat .] 1. Concealed or hidden out of the way. [ Obsolete] « The eternal eye wh...
Found on http://www.encyclo.co.uk/webster/A/10

abstruse

deep adjective difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; `the professor`s lectures were so abstruse that students tended to avoid them`; `a deep metaphysical theory`; `some recondite problem in historiography`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=abstruse

Abstruse

• (a.) Concealed or hidden out of the way. • (a.) Remote from apprehension; difficult to be comprehended or understood; recondite; as, abstruse learning.
Found on http://thinkexist.com/dictionary/meaning/abstruse/

abstruse

abstruse 1. Concealed or hidden; hard to understand, deep; obscure. 2. Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge. 3. Secret, hidden. 4. Etymology: from Latin abstrusus, past participle of abstrudere, 'conceal'; litterally, 'to thrust away', from ab-, 'away' + trudere 'to thrust, to push'.
Found on http://www.wordinfo.info/words/index/info/view_unit/2193/
No exact match found