Source : Webster's Revised Unabridged Dictionary (1913)

Sharp \Sharp\, a. [Compar. {Sharper}; superl. {Sharpest}.] [OE.
   sharp, scharp, scarp, AS. scearp; akin to OS. skarp, LG.
   scharp, D. scherp, G. scharf, Dan. & Sw. skarp, Icel. skarpr.
   Cf. {Escarp}, {Scrape}, {Scorpion}.]
   1. Having a very thin edge or fine point; of a nature to cut
      or pierce easily; not blunt or dull; keen.

            He dies upon my scimeter's sharp point. --Shak.

   2. Terminating in a point or edge; not obtuse or rounded;
      somewhat pointed or edged; peaked or ridged; as, a sharp
      hill; sharp features.

   3. Affecting the sense as if pointed or cutting, keen,
      penetrating, acute: to the taste or smell, pungent, acid,
      sour, as ammonia has a sharp taste and odor; to the
      hearing, piercing, shrill, as a sharp sound or voice; to
      the eye, instantaneously brilliant, dazzling, as a sharp
      flash.

   4. (Mus.)
      (a) High in pitch; acute; as, a sharp note or tone.
      (b) Raised a semitone in pitch; as, C sharp (C[sharp]),
          which is a half step, or semitone, higher than C.
      (c) So high as to be out of tune, or above true pitch; as,
          the tone is sharp; that instrument is sharp. Opposed
          in all these senses to {flat}.

   5. Very trying to the feelings; piercing; keen; severe;
      painful; distressing; as, sharp pain, weather; a sharp and
      frosty air.

            Sharp misery had worn him to the bones. --Shak.

            The morning sharp and clear.          --Cowper.

            In sharpest perils faithful proved.   --Keble.

   6. Cutting in language or import; biting; sarcastic; cruel;
      harsh; rigorous; severe; as, a sharp rebuke. ``That sharp
      look.'' --Tennyson.

            To that place the sharp Athenian law Can not pursue
            us.                                   --Shak.

            Be thy words severe, Sharp as merits but the sword
            forbear.                              --Dryden.

   7. Of keen perception; quick to discern or distinguish;
      having nice discrimination; acute; penetrating; sagacious;
      clever; as, a sharp eye; sharp sight, hearing, or
      judgment.

            Nothing makes men sharper . . . than want.
                                                  --Addison.

            Many other things belong to the material world,
            wherein the sharpest philosophers have never ye?
            arrived at clear and distinct ideas.  --L. Watts.

   8. Eager in pursuit; keen in quest; impatient for
      gratification; keen; as, a sharp appetite.

   9. Fierce; ardent; fiery; violent; impetuous. ``In sharp
      contest of battle.'' --Milton.

            A sharp assault already is begun.     --Dryden.

   10. Keenly or unduly attentive to one's own interest; close
       and exact in dealing; shrewd; as, a sharp dealer; a sharp
       customer.

             The necessity of being so sharp and exacting.
                                                  --Swift.

   11. Composed of hard, angular grains; gritty; as, sharp sand.
       --Moxon.

   12. Steep; precipitous; abrupt; as, a sharp ascent or
       descent; a sharp turn or curve.

   13. (Phonetics) Uttered in a whisper, or with the breath
       alone, without voice, as certain consonants, such as p,
       k, t, f; surd; nonvocal; aspirated.

   Note: Sharp is often used in the formation of self-explaining
         compounds; as, sharp-cornered, sharp-edged,
         sharp-pointed, sharp-tasted, sharp-visaged, etc.

   {Sharp practice}, the getting of an advantage, or the attempt
      to do so, by a tricky expedient.

   {To brace sharp}, or {To sharp up} (Naut.), to turn the yards
      to the most oblique position possible, that the ship may
      lie well up to the wind.

   Syn: Keen; acute; piercing; penetrating; quick; sagacious;
        discerning; shrewd; witty; ingenious; sour; acid; tart;
        pungent; acrid; severe; poignant; biting; acrimonious;
        sarcastic; cutting; bitter; painful; afflictive;
        violent; harsh; fierce; ardent; fiery.