Rigid; severe (5)
I believe the answer is:
stiff
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">rigid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that rigid can be written as stiff)</span><br/ ><br/ >'<span class="explanation-format__original">severe</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for stiff that I've seen before include "Inflexible" , "Rigid, prim" , "Not easily bent" , "cheat" , "Rigid, unbending" .)