modified
incapable, powerless, weak, incompetent, unskilled, impotent, not able, inept, incapacitated, impuissant, inefficacious, helpless, unfitted, inefficient, unqualified, inadequate, ineffectual, inoperative.
Antonyms able*, capable, effective.
See unable in Webster's New World Roget's A-Z Thesaurus II
Totally incapable of doing a job:
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Browse entries near unable
unabashed
unabashedly
unabated
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unable
UNABOM
UNABR
unabridged
unabridged (synonyms)
UNAC