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unable

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unable
un‧a‧ble W2 /ʌnˈeɪbəl/ adjective [not before noun]
 Word Family: noun: ability ≠ inability, disability; adjective: able ≠ unable, disabled; verb: enable ≠ disable; adverb: ably
not able to do something ⇨ inability
    unable to do something
    Lucy was unable to find out what had happened.
    Unable to sleep, I got up and made myself a drink.
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    In everyday English, people usually say that they can't/couldn't do something rather than are/were unable to do something:
   ▪ She couldn't find out what had happened.