The Collaborative International Dictionary of English v.0.48:

Slipshod \Slip"shod`\, a.
   1. Wearing shoes or slippers down at the heel.
      [1913 Webster]

            The shivering urchin bending as he goes,
            With slipshod heels.                  --Cowper.
      [1913 Webster]

   2. Figuratively: Careless in dress, manners, style, etc.;
      slovenly; shuffling; as, slipshod manners; a slipshod or
      loose style of writing.
      [1913 Webster]

            Thy wit shall ne'er go slipshod.      --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

slipshod
    adj 1: marked by great carelessness; "a most haphazard system of
           record keeping"; "slapdash work"; "slipshod spelling";
           "sloppy workmanship" [syn: haphazard, slapdash,
           slipshod, sloppy]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "slipshod":
   barbarous, beat-up, bedraggled, blowzy, botched, bungling,
   careless, chintzy, clumsy, deficient, dilapidated, disheveled,
   disorganized, down-at-heel, drabbletailed, draggled, draggletailed,
   easy, easygoing, erroneous, faulty, frowzy, frumpish, frumpy,
   grubby, half-assed, haphazard, hit-and-miss, hit-or-miss,
   imperfect, impotent, imprecise, improper, in rags, inaccurate,
   incorrect, indifferent, inexact, infelicitous, informal, lax,
   lenient, loose, lumpen, messy, mussy, neglected, negligent,
   overindulgent, overpermissive, permissive, poky, promiscuous,
   ragged, raggedy, raunchy, relaxed, remiss, ruinous, scraggly,
   scrubby, scruffy, seedy, shabby, shoddy, slack, slapdash,
   slaphappy, slatternly, slipshoddy, sloppy, slovenly, sluttish,
   soft, solecistic, sordid, squalid, tacky, tattered, threadbare,
   ungrammatic, unkempt, unmeticulous, unneat, unorganized,
   unrestrained, unsightly, unthorough, untidy, weak