anxious

adj. fearful, worried; worrisome; craving, yearning; eager

Anxiety is a physiological state characterized by cognitive, somatic, emotional, and behavioral components (Seligman, Walker & Rosenhan, 2001). These components combine to create the feelings that we typically recognize as fear, apprehension, or worry. Anxiety is often accompanied by physical sensations such as heart palpitations, nausea, chest pain, shortness of breath, or headache.
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Anxiety is a multisystem response to a perceived threat or danger. It reflects a combination of biochemical changes in the body, [more]Anxious - Community and Resources

Adjective
1. mentally upset over possible misfortune or danger etc; worried; "anxious parents"; "anxious about her job"; "not used to a city and anxious about small things"; "felt apprehensive about the consequences"
(synonym) apprehensive
(similar) uneasy
2. eagerly desirous; "anxious to see the new show at the museum"; "dying to hear who won"
(synonym) anxious(p), dying(p)
(similar) eager
(classification) colloquialism
3. causing or fraught with or showing anxiety; "spent an anxious night waiting for the test results"; "cast anxious glances behind her"; "those nervous moments before takeoff"; "an unquiet mind"
(synonym) nervous, uneasy, unquiet
(similar) troubled

(a.)
Full of anxiety or disquietude; greatly concerned or solicitous, esp. respecting something future or unknown; being in painful suspense; -- applied to persons; as, anxious for the issue of a battle.
  

(a.)
Earnestly desirous; as, anxious to please.
  

(a.)
Accompanied with, or causing, anxiety; worrying; -- applied to things; as, anxious labor.