Etymology
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feckless (adj.)

1590s, from feck, "effect, value, vigor" (late 15c.), Scottish shortened form of effect (n.), + -less. Popularized by Carlyle, who left its opposite, feckful, in dialectal obscurity. Related: Fecklessly; fecklessness.

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Definitions of feckless

feckless (adj.)
not fit to assume responsibility;
feckless (adj.)
generally incompetent and ineffectual;
feckless attempts to repair the plumbing
Synonyms: inept
From wordnet.princeton.edu