What does SHARP mean?

adjective

1. (of something seen or heard) clearly defined“a sharp photographic image”
2. ending in a sharp point
3. having or demonstrating ability to recognize or draw fine distinctions“an acute observer of politics and politicians”
4. marked by practical hardheaded intelligence“a smart businessman”
5. harsh“sharp criticism”
6. having or emitting a high-pitched and sharp tone or tones“a shrill whistle”
7. extremely steep“an abrupt canyon”
8. keenly and painfully felt; as if caused by a sharp edge or point“a sharp pain”