unable

adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about unable at Wordnik → Where our words come from →

1. (usually followed by `to') not having the necessary means or skill or know-how.

   unable to get to town without a car

2. (usually followed by `to') lacking necessary physical or mental ability.

   dyslexics are unable to learn to read adequately

3. Lacking in power or forcefulness.

   an ineffectual ruler