Mediocre, average (4)
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">mediocre</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">average</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for so-so that I've seen before include "Nothing to write home about" , "Tolerable, indifferent" , "Of middling quality" , "OK, but nothing special" , "Indifferently good" .)
(Other definitions for soso that I've seen before include "mediocre" , "Indifferent" .)