The Collaborative International Dictionary of English v.0.48:

Aloof \A*loof"\, adv. [Pref. a- + loof, fr. D. loef luff, and so
   meaning, as a nautical word, to the windward. See Loof,
   Luff.]
   1. At or from a distance, but within view, or at a small
      distance; apart; away.
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            Our palace stood aloof from streets.  --Dryden.
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   2. Without sympathy; unfavorably.
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            To make the Bible as from the hand of God, and then
            to look at it aloof and with caution, is the worst
            of all impieties.                     --I. Taylor.
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The Collaborative International Dictionary of English v.0.48:

Aloof \A*loof"\, prep.
   Away from; clear from. [Obs.]
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         Rivetus . . . would fain work himself aloof these rocks
         and quicksands.                          --Milton.
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The Collaborative International Dictionary of English v.0.48:

Aloof \A*loof"\, n. (Zool.)
   Same as Alewife.
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WordNet (r) 3.0 (2006):

aloof
    adv 1: in an aloof manner; "the local gentry and professional
           classes had held aloof for the school had accepted their
           sons readily enough"
    adj 1: remote in manner; "stood apart with aloof dignity"; "a
           distant smile"; "he was upstage with strangers" [syn:
           aloof, distant, upstage]