Definition of half-assed in US English:

half-assed

(British half-arsed)

adjective

informal
  • Done with little effort or care; incompetent or inadequate.

    ‘a half-assed attempt to rectify the problem’
    foolish, silly, unintelligent, idiotic, brainless, mindless, scatterbrained, crackbrained, nonsensical, senseless, irresponsible, unthinking, ill-advised, ill-considered, inept, witless, damfool, unwise, injudicious, indiscreet, short-sighted
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Pronunciation

half-assed

/ˈhæfæst//ˈhafast/