Steady, sober (5)
I believe the answer is:
staid
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">steady</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">sober</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for staid that I've seen before include "Dully unadventurous" , "Very conventional and dull" , "Conventional (character)" , "Sedate and serious" , "Settled" .)