adjective

1. suitable for use in cutting or piercing; having a very thin edge or fine point; keen
2. having a point or edge; not rounded or blunt; peaked a sharp ridge, features, etc.
3. not gradual; abrupt; acute a sharp turn
4. clearly defined; distinct; clear a sharp contrast
5. made up of hard, angular particles, as sand
6. quick, acute, or penetrating in perception or intellect; specif.,
   1. acutely sensitive in seeing, hearing, etc.
   2. clever; shrewd
7. showing or having a keen awareness; attentive; vigilant a sharp lookout
8. crafty; designing; underhanded
9. harsh, biting, or severe a sharp temper, criticism, etc.
10. violent or impetuous; sudden and forceful a sharp attack
11. brisk; active; vigorous a sharp run
12. having a keen effect on the senses or feelings; specif.,
    1. severe; intense; acute; keen a sharp pain, grief, appetite, etc.
    2. strong; biting; pungent, as in taste or smell
    3. high-pitched; shrill a sharp sound
    4. brilliant; intense a sharp flash of light
    5. cold and cutting a sharp wind
13. Slang attractively or stylishly dressed or groomed
14. Music
    1. higher in pitch by a half step C sharp (C)
    2. out of tune by being above the true or proper pitch

Etymology: ME < OE scearp, akin to Ger scharf, ON skarpr < IE *(s)kerb(h)- < base *(s)ker-, to cut > shear, harvest, L caro, flesh

adverb

1. in a sharp manner; specif.,
   1. abruptly or briskly
   2. attentively or alertly
   3. so as to have a sharp point or edge
   4. keenly; piercingly
   5. Music above the true or proper pitch
2. precisely; exactly one o'clock sharp

noun

1. a sewing needle with an extremely fine point
2. Informal an expert or adept
3. Informal shark, sharper
4. Music
   1. a note or tone one half step above another
   2. the sign () indicating such a note

transitive verb

intransitive verb