"apprehensive" in the adjective sense
1. apprehensive, discerning
quick to understand
"a kind and apprehensive friend"- Nathaniel Hawthorne
2. apprehensive, worried
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"
3. apprehensive
in fear or dread of possible evil or harm
"apprehensive for one's life"
"apprehensive of danger"
Source: WordNet® (An amazing lexical database of English)
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