Pulpit Ignorantics: I've Worked Untirelessly!

[Submitted by Reader] Of course UN means anti- or not.  I was sitting in the reception last night and heard an unnamed clergy member get up to the microphone and reference just how hard the committee worked for the event.  They mentioned something to the effect "I'd  like to thank the XYZ committee who worked so UNTIRELESSLY."  *me; insert puzzled look*  I knew what they meant...but I'm just saying. *pearl clutch; rear back*