I am really sorry you had bad experience with the extension. I would need some logs to exactly find the problem. Were you using any VPN? There might be case that due to excessive usage of addon, google returned captcha and that is why extension was not able to parse word meaning. Whenever you see this issue again, could you try to find meaning of very simple word that surely has meaning and if that returned no definition found, check that you can search on google, I feel this is due to captcha or vpn, somehow google stopped returning results.