Tra từ sharp - Từ điển American Heritage Dictionary 4th

sharp (shärp)adj. sharp·er, sharp·est
1. Having a thin edge or a fine point suitable for or capable of cutting or piercing.
2.
a. Having clear form and detail:
a sharp photographic image.
b. Terminating in an edge or a point:
sharp angular cliffs; a sharp nose.
c. Clearly and distinctly set forth:
sharp contrasts in behavior.
3. Abrupt or acute:
a sharp drop; a sharp turn.
4.
a. Intellectually penetrating; astute.
b. Marked by keenness and accuracy of perception:
sharp hearing.
5. Crafty or deceitful, as in business dealings:
sharp selling practices.
6. Vigilant; alert:
kept a sharp lookout for shoplifters.
7.
a. Briskly or keenly cold and cutting:
a sharp wind.
b. Harsh or biting in tone or character:
sharp criticism.
8. Fierce or impetuous; violent:
a sharp temper; a sharp assault.
9. Intense; severe:
a sharp pain.
10.
a. Sudden and shrill:
a sharp whistle.
b. Sudden and brilliant or dazzling:
a sharp flash of lightning.
11. Strongly affecting the senses of smell and taste:
a sharp pungent odor; a sharp cheese.
12. Composed of hard angular particles:
sharp sand.
13. Music.
a. Raised in pitch by a semitone.
b. Being above the proper pitch.
c. Having the key signature in sharps.
14. Informal. Attractive or stylish:
a sharp jacket.
See Synonyms at fashionable.adv.
1. In a sharp manner:
hit me sharp on the brow.
2. Punctually; exactly:
at three o'clock sharp.
3. Music. Above the true or proper pitch.n.
1. Music.
a. A sign (♯) used to indicate that a note is to be raised by a half step.
b. A note that is raised a half step.
2. A slender sewing needle with a very fine point.
3. Informal.
a. An expert.
b. A shrewd cheater; a sharper.v. Music sharped, sharp·ing, sharpsv. tr.
To raise in pitch by a semitone.v. intr.
To play or sing above the proper pitch. [Middle English scharp, from Old English scearp. See sker-¹ in Indo-European Roots.] sharpʹly adv.sharpʹness n.
Synonyms: sharp, keen¹, acute
These adjectives all apply literally to fine edges, points, or tips. Figuratively they indicate mental alertness and clarity of comprehension. Sharp suggests quickness and astuteness: “a young man of sharp and active intellect” (John Henry Newman). Keen implies clear-headedness and acuity: a journalist with a keen mind and quick wits. Acute suggests penetrating perception or discernment: an acute observer of national politics.