Impenetrable (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impenetrable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for dense that I've seen before include "Close knit" , "Thick, compact or crowded" , "Thick; stupid" , "Stupid; compacted" , "Closely packed" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impenetrable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for opaque that I've seen before include "Hard to understand, see through" , "Not transparent, light can't pass through" , "Hazy, unclear" , "Not clearly expressed" , "Unintelligible" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impenetrable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for deep that I've seen before include "greatly involved?" , "dangerous for swimming?" , "hard to follow" , "Sunk low" , "Intense; low (in pitch)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impenetrable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for impervious that I've seen is " impossible to pass".)