Peaceful, undisturbed (4)
I believe the answer is:
calm
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">peaceful</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">undisturbed</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for calm that I've seen before include "Composed and collected" , "Composure or serenity" , "Placid and unruffled" , "Serene" , "Cool, not excited" .)