The description of marker can be omitted, then it will have just the title.
Or you don’t want the marker to have the info-window at all?
Please specify what exactly do you want? How do you want to hide the marker description?
As we discussed in the Internal Support we will add the option “Disable marker info window” for you, which will hide popup with description of the marker on the map. It will be released in one of the new versions of Google Maps plugin. Tell me please, will such option suit your needs?