thrive - make steady progress; be at the high point in one's career or reach a high point in historical significance
Zoey," I thought I better take over because Susan is not thriving. I am here to tell you she spent most of the day lounging on the sofa complaining about her stomach. She finally gets a burst of energy to write this blog and Typepad freezes twice. She was trying to write something about how that red tree was once so small and is now big. Oh now I understand… so that's why she was looking up the word thrive. The opposite of to thrive is to deteriorate or to fail which better describes Susan's day. I know she will want to end this blog with something positive. So a picture of her studio wall feels positive to me."