apprehensive

(s) quick to understand
- "a kind and apprehensive friend"- Nathaniel Hawthorne
discerning,
(s) mentally upset over possible misfortune or danger etc
- apprehensive about her job
- not used to a city and worried about small things
- felt apprehensive about the consequences
worried,
(s) in fear or dread of possible evil or harm
- apprehensive for one's life
- apprehensive of danger

discerning worried

apprehension

apprehensively apprehensiveness