General synonyms:
* Anxious
* Apprehensive
* Concerned
* Distressed
* Uneasy
* Troubled
More specific synonyms:
* Fretful: implies a feeling of constant worry and anxiety.
* Nervous: suggests a feeling of unease and apprehension, often stemming from a specific event or situation.
* Stressed: emphasizes the feeling of pressure and tension caused by worries.
* Panicked: indicates a sudden feeling of intense fear and anxiety.
* Haunted: implies that worries are persistent and difficult to shake off.
Formal synonyms:
* Solicitous: implies concern and care for someone else.
* Apprehensive: emphasizes a feeling of fear or doubt about the future.
Informal synonyms:
* Bugged: suggests a feeling of annoyance or frustration.
* Freaked out: indicates a strong feeling of fear or anxiety.
Ultimately, the best entry word will depend on the specific situation and the emotion you want to express.