There is another method, if you know what you are doing.
As the text in the image you are showing is slightly cut off, I assume you are talking about the mainblock.
You have a setting there, called:
Activate Dynamic Content for Mainblock
this will determine the height of the shown block. (inside) it is set by default to something around 155 if your thumbnail size is 100 (leaving 55 pixels for the text)
Play around with it. set it to something like your thumbnailsize plus 5 and it should hide the text. (you might have to refresh the page twice before you see the change)