failed (part of speech: verb)
unsuccessful (part of speech: adjective)
neglected (part of speech: verb)
- My eyes have failed me a little, else I might. - "The Three Heron's Feathers", Hermann Sudermann.
- In years gone by I tried to do good to this land, and I failed. - "The Weavers, Complete", Gilbert Parker Last Updated: March 14, 2009.
- Peace failed to understand. - "Heart of Gold", Ruth Alberta Brown.