The Collaborative International Dictionary of English v.0.48:

Adrift \A*drift"\, adv. & a. [Pref. a- (for on) + drift.]
   Floating at random; in a drifting condition; at the mercy of
   wind and waves. Also fig.
   [1913 Webster]

         So on the sea shall be set adrift.       --Dryden.
   [1913 Webster]

         Were from their daily labor turned adrift.
                                                  --Wordsworth.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adrift
    adv 1: floating freely; not anchored; "the boat wasset adrift"
    2: off course, wandering aimlessly; "there was a search for
       beauty that had somehow gone adrift"
    adj 1: aimlessly drifting [syn: adrift(p), afloat(p),
           aimless, directionless, planless, rudderless,
           undirected]
    2: afloat on the surface of a body of water; "after the storm
       the boats were adrift"

Moby Thesaurus II by Grady Ward, 1.0:

182 Moby Thesaurus words for "adrift":
   abashed, aberrant, abroad, afloat, all abroad, all off, all wrong,
   alternating, amiss, amorphous, askew, astray, at fault, at sea,
   aweigh, awry, beside the mark, beside the point,
   beside the question, bewildered, bothered, capricious, cast-off,
   changeable, changeful, clear, clueless, confused, corrupt,
   deceptive, defective, delusive, desultory, deviable, deviant,
   deviational, deviative, discomposed, disconcerted, dismayed,
   disoriented, distorted, distracted, distraught, disturbed, dizzy,
   eccentric, embarrassed, errant, erratic, erring, erroneous,
   extraneous, extrinsic, fallacious, false, fast and loose, faultful,
   faulty, fickle, fitful, flawed, flickering, flighty, flitting,
   floating, fluctuating, freakish, free, giddy, guessing, heretical,
   heterodox, illogical, illusory, immaterial, impertinent, impetuous,
   impulsive, in a fix, in a maze, in a pickle, in a scrape,
   in a stew, inadmissible, inapplicable, inapposite, inappropriate,
   incidental, inconsequent, inconsistent, inconstant, indecisive,
   infirm, irregular, irrelative, irrelevant, irresolute,
   irresponsible, loose, lost, mazed, mazy, mercurial, moody,
   nihil ad rem, nonessential, not at issue, not right, not true, off,
   off the subject, off the track, out, out-of-the-way, parenthetical,
   peccant, perturbed, perverse, perverted, put-out, rambling,
   restless, rickety, roving, scatterbrained, self-contradictory,
   shaky, shapeless, shifting, shifty, shuffling, spasmodic,
   spineless, started, straying, turned around, unaccountable,
   unanchored, unbound, uncertain, uncontrolled, undependable,
   undisciplined, undone, unessential, unfactual, unfastened, unfixed,
   unmoored, unorthodox, unpredictable, unproved, unreliable,
   unrestrained, unsettled, unstable, unstable as water, unstaid,
   unsteadfast, unsteady, unstuck, untied, untrue, upset, vacillating,
   vagrant, variable, vicissitudinary, vicissitudinous, volatile,
   wandering, wanton, wavering, wavery, wavy, wayward, whimsical,
   wide, wishy-washy, without a clue, wrong