Weak, frail (6)
I believe the answer is:
feeble
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">weak</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that weak can be written as feeble)</span><br/ ><br/ >'<span class="explanation-format__original">frail</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for feeble that I've seen before include "Very weak, infirm" , "Wimpish" , "Physically weak or lacking effectiveness" , "Very weak, without strength" , "Weak, frail" .)