Abstruse (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstruse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for arcane that I've seen before include "Mysterious, understood by few" , "cryptic" , "Abstruse, mysterious" , "Requiring secret or mysterious knowledge" , "Mysterious, secret or obscure" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstruse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for obscure that I've seen before include "Not clearly expressed" , "Vague - mask" , "Cloudy or veiled" , "Dull or impenetrable" , "Not clear, indistinct" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstruse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for deep that I've seen before include "down a long way" , "Mysterious" , "Heartfelt" , "Wise - difficult to understand" , "Cavernous" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstruse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for esoteric that I've seen before include "Private, confined to a select group" , "Aimed at a few" , "of rarefied tastes" , "Secret, mysterious" , "Secret, private" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abstruse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for recondite that I've seen before include "Enigmatic" , "not widely known" , "Mysterious" , "Difficult to understand" , "Abstruse" .)