Definitions by Dr. H.B. Cromwell

woolwort 

adj.
Somebody who makes promises or says things but doesn't follow through with them. Gives excuses such as "too much homework" or "taking an extra course". Usually just lying to get out of it or to irritate people.

"sorry guys, i can't do that, i've got a lot of homework" *leaves*
"He's such a woolwort."

woolwort by Dr. H.B. Cromwell January 22, 2009