incapable, powerless, weak, incompetent, unskilled, impotent, not able, inept, incapacitated, impuissant, inefficacious, helpless, unfitted, inefficient, unqualified, inadequate, ineffectual, inoperative.
Antonyms able*, capable, effective.
"unable." YourDictionary, n.d. Web. 20 January 2019. <https://thesaurus.yourdictionary.com/UNABLE>.
unable. (n.d.). Retrieved January 20th, 2019, from https://thesaurus.yourdictionary.com/UNABLE
Totally incapable of doing a job:
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