"unable" in the adjective sense
1. unable
usually followed by `to') not having the necessary means or skill or know-how
"unable to get to town without a car"
"unable to obtain funds"
2. unable
usually followed by `to') lacking necessary physical or mental ability
"dyslexics are unable to learn to read adequately"
"the sun was unable to melt enough snow"
3. ineffective, ineffectual, unable
lacking in power or forcefulness
"an ineffectual ruler"
"like an unable phoenix in hot ashes"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License