Umpteen (4)
I believe the answer is:
many
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">umpteen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for many that I've seen before include "legion" , "regarded as a large number" , "Numerous" , "A lot of" , "multitude" .)