anxiety |a ng ˈzī-itē|

noun ( pl. -ties)
a feeling of worry, nervousness, or unease, typically about an imminent event or something with an uncertain outcome : he felt a surge of anxiety | anxieties about the moral decline of today's youth.
• [ with infinitive ] desire to do something, typically accompanied by unease : the housekeeper's eager anxiety to please.

(Oxford American Dictionaries)