feckless

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Feckless \Feck"less\, a. [Perh. a corruption of effectless.]
   Spiritless; weak; worthless. [Scot]
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

66 Moby Thesaurus words for "feckless":
      aimless, barren, bootless, carefree, careless, counterproductive,
      easygoing, effete, empty, etiolated, fatuitous, fatuous, fruitless,
      fustian, futile, good-for-nothing, grasshopper, happy-go-lucky,
      heedless, impotent, improvident, inadequate, inadvertent, inane,
      incautious, ineffective, ineffectual, inefficacious, inoperative,
      invalid, irresponsible, lackadaisical, meaningless, negligent,
      no go, nonchalant, nugacious, nugatory, of no force, of no use,
      pointless, purposeless, reckless, remiss, shiftless, sterile,
      superfluous, thoughtless, thriftless, unavailing, uncaring,
      undependable, uneconomical, unheeding, unproviding, unpurposed,
      unreflective, unreliable, unthinking, unthrifty, untrustworthy,
      useless, vain, wild, worthless, wrecking