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Unable

[uhn-ey-buhl]

Origin

adjective

lacking the necessary power, competence, etc., to accomplish some specified act: He was unable to swim.

Origin:
1350–1400; Middle English; see un-¹, able

Synonyms
See incapable.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Unable is always a great word to know.

So is slumgullion. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a stew of meat, vegetables, potatoes, etc.

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Collins

World English Dictionary

unable (ʌnˈeɪb^əl)

—*adj* (foll by to)
1.	lacking the necessary power, ability, or authority (to do something); not able
2.	archaic incompetent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

unable

c.1380, from un- (1) "not" + able. Modeled on O.Fr. inhabile or L. inhabilis.

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"The LORD will afflict you with madness, blindness, and confusion of mind; you shall grope about at noon as blind people grope in darkness, but you shall be unable to find your way; and you shall be continually abused and robbed, without anyone to help."

-unknown author

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Unable

un·a·ble