Dictionary.com/feckless (etymology):

feckless (FEK-lis) adjective

1. Lacking purpose or vitality; feeble or ineffective.
2. Careless and irresponsible.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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adj 1: not fit to assume responsibility 2: generally incompetent and ineffectual; “feckless attempts to repair the plumbing”; “inept handling of the account” [syn: inept]

Source: WordNet ® 2.0, © 2003 Princeton University

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