1. Uneasy and apprehensive about an uncertain event or matter; worried.
2. Attended with, showing, or causing anxiety: "She spent an anxious night waiting for the test results."
3. Full of mental distress or uneasiness because of fear of danger or misfortune; greatly worried; solicitous: "Her parents were anxious about her poor health."
4. Earnestly desirous; eager (usually followed by an infinitive or for): "They were anxious to please"; "They were anxious for our happiness."
5. Attended with or showing solicitude or uneasiness: "He had anxious forebodings about going on the trip."

Anxious has a long history of use roughly as a synonym for eager, but many prefer that anxious be used only when its subject is worried or uneasy about an anticipated event.

Anxious and eager are somewhat analogous in meaning but careful speakers and writers use anxious when some doubt or worry exists; as, "She is anxious because the plane is long overdue." It is eager when the mood is one of joyous anticipation: "I am eager to hear the awards announced."

Delirium in which the predominating symptom is an incoherent apprehension or anxiety.

Excessively anxious.