General Fear:
* Scared
* Frightened
* Terrified
* Timid
* Nervous
* Anxious
* Apprehensive
* Concerned
Specific Fears:
* Fearful: Strong fear of something specific
* Panicked: Overwhelmed by fear and losing control
* Petrified: Frozen with fear, completely immobilized
* Daunted: Discouraged by fear, hesitant to proceed
* Hesitant: Uncertain due to fear, reluctant
* Appalled: Shocked and disgusted by something
* Dismayed: Disheartened and discouraged
Less Intense:
* Worried: Anxious about something specific
* Uneasy: A general feeling of discomfort and anxiety
* Cautious: Careful and hesitant due to potential danger
* Wary: Suspicious and watchful
* On edge: Nervous and tense
* Queasy: Feeling of unease and apprehension
Figurative:
* Dreading: Looking forward with apprehension
* Trembling: Shaking from fear
* Cringing: Shrinking back in fear
* Shuddering: Involuntarily shaking from fear or disgust
The best synonym will depend on the specific context and the intensity of the fear being conveyed.