Oxford Advanced American Dictionary

Definition of unable adjective from the Oxford Advanced Learner's Dictionary

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unable

adjective
unable pronunciation English ʌnˈeɪbl unable pronunciation American ʌnˈeɪbl
 
[not before noun] unable to do something (rather formal) not having the skill, strength, time, knowledge, etc. to do somethingHe lay there, unable to move.I tried to contact him but was unable to.She was unable to hide her excitement.Let us know if you're unable to come.They have been unable or unwilling to resolve the conflict.
Opposite
able