Or you could add a CSS rule to hide the thead element containing the column headers.
Make sure to add an additional CSS class to the entity list to only hide the header for this specific list - otherwise it will hide all headers.
You can add additional classes for the list in the portal management app > Lists > Options > Gridconfiguration > CSS Class (do not forget to enable the 'Advanced Settings' checkbox at the top of the grid configuration section)
After that you can add the CSS to either the general CSS file or to the CSS section of the specific webpage.
.MyAddedCustomClass .view-grid thead{
display:none;
}
