Source : Webster's Revised Unabridged Dictionary (1913)

Impatient \Im*pa"tient\, a. [OE. impacient, F. impatient, fr. L.
   impatiens; pref. im- not + patiens patient. See {Patient}.]
   1. Not patient; not bearing with composure; intolerant;
      uneasy; fretful; restless, because of pain, delay, or
      opposition; eager for change, or for something expected;
      hasty; passionate; -- often followed by at, for, of, and
      under.

            A violent, sudden, and impatient necessity. --Jer.
                                                  Taylor.

            Fame, impatient of extremes, decays Not more by envy
            than excess of praise.                --Pope.

            The impatient man will not give himself time to be
            informed of the matter that lies before him.
                                                  --Addison.

            Dryden was poor and impatient of poverty.
                                                  --Macaulay.

   2. Not to be borne; unendurable. [Obs.] --Spenser.

   3. Prompted by, or exhibiting, impatience; as, impatient
      speeches or replies. --Shak.

   Syn: Restless; uneasy; changeable; hot; eager; fretful;
        intolerant; passionate.

Impatient \Im*pa"tient\, n.
   One who is impatient. [R.]

Source : WordNet®

impatient
     adj 1: restless or short of temper under delay or opposition;
            "impatient with the slower students"; "impatient of
            criticism" [ant: {patient}]
     2: (usually followed by `to') full of eagerness; "impatient to
        begin"; "raring to go" [syn: {impatient(p)}, {raring(p)}]