Definitions of apprehensive:

• adjective:   quick to understand

  Example: "A kind and apprehensive friend- Nathaniel Hawthorne"

• adjective:   in fear or dread of possible evil or harm

  Example: "Apprehensive for one's life"

• adjective:   mentally upset over possible misfortune or danger etc; worried

  Example: "Felt apprehensive about the consequences"