apprehensive

Synonyms: afraid alarmed biting nails butterflies concerned disquieted doubtful feel in bones foreboding frozen get vibes have a hunch have cold feet have funny feeling have stage fright hung up in a cold sweat in a dither in a sweat jellyfish jittery jumpy lily-livered mistrustful running scared scaredy-cat shaky stiff suspicious troubled uncertain uneasy uptight weak worried worried sick

Antonyms: at ease calm quiet unafraid undoubting unfearful unsuspicious unworried