The Collaborative International Dictionary of English v.0.48:

Inquisitive \In*quis"i*tive\, n.
   A person who is inquisitive; one curious in research. --Sir
   W. Temple.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inquisitive \In*quis"i*tive\, a. [OE. inquisitif, F.
   inquisitif.]
   1. Disposed to ask questions, especially in matters which do
      not concern the inquirer.
      [1913 Webster]

            A wise man is not inquisitive about things
            impertinent.                          --Broome.
      [1913 Webster]

   2. Given to examination, investigation, or research;
      searching; curious.
      [1913 Webster]

            A young, inquisitive, and sprightly genius. --I.
                                                  Watts.

   Syn: Inquiring; prying; curious; meddling; intrusive.

   Usage: Inquisitive, Curious, Prying. Curious denotes a
          feeling, and inquisitive a habit. We are curious when
          we desire to learn something new; we are inquisitive
          when we set ourselves to gain it by inquiry or
          research. Prying implies inquisitiveness, and is more
          commonly used in a bad sense, as indicating a desire
          to penetrate into the secrets of others.
          [1913 Webster]

                [We] curious are to hear,
                What happens new.                 --Milton.
          [1913 Webster]

                This folio of four pages [a newspaper], happy
                work!
                Which not even critics criticise; that holds
                Inquisitive attention, while I read. --Cowper.
          [1913 Webster]

                Nor need we with a prying eye survey
                The distant skies, to find the Milky Way.
                                                  --Creech.
          [1913 Webster]

WordNet (r) 3.0 (2006):

inquisitive
    adj 1: showing curiosity; "if someone saw a man climbing a light
           post they might get inquisitive"; "raised a speculative
           eyebrow" [syn: inquisitive, speculative,
           questioning, wondering(a)]
    2: inquiring or appearing to inquire; "an inquiring look"; "the
       police are proverbially inquisitive"