Nerve-racking (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nerve-racking</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stressful that I've seen before include "Worrying" , "Very hard on the nerves" , "Causing mental tension" , "under great pressure" , "tense" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nerve-racking</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tense that I've seen before include "(Of muscle) tight" , "Unrelaxed; form of verb" , "Not relaxed" , "Subject to strain" , "Nerve-racking" .)