The Collaborative International Dictionary of English v.0.48:

Unconditional \Un`con*di"tion*al\, a.
   Not conditional, limited, or conditioned; made without
   condition; absolute; unreserved; as, an unconditional
   surrender.
   [1913 Webster]

         O, pass not, Lord, an absolute decree,
         Or bind thy sentence unconditional.      --Dryden.
   [1913 Webster] -- Un`con*di"tion*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unconditionally
    adv 1: not subject to a condition; "he accepted the offer
           unconditionally" [ant: conditionally]
    2: in an unqualified manner; "he flatly denied the charges"
       [syn: flatly, categorically, unconditionally]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "unconditionally":
   a outrance, absolutely, all out, altogether, beyond all bounds,
   beyond compare, beyond comparison, beyond measure, completely,
   comprehensively, dead, downright, entirely, essentially,
   exhaustively, extremely, flat out, fully, fundamentally, globally,
   hundred per cent, immeasurably, in full, in full measure,
   in the extreme, incalculably, inclusively, indefinitely,
   infinitely, inside out, integrally, largely, most, one and all,
   outright, perfectly, purely, radically, roundly, thoroughly,
   to the hilt, totally, tout a fait, unequivocally, unreservedly,
   utterly, wholly, with a vengeance