My solution was the word "bound" because it means that you either "move" or that you "cannot move". But now looking for this at google I found a cool site with tons of word that imo fit for the puzzle question.
http://towerofenglish.com/cellisantagonym.html
some examples:
clip (to attach - to cut off)
fearful (causing fear - being afraid)
overlook (to pay attention - to ignore)
left (to remain - to have gone)