adjective
experiencing worry, unease, or nervousness, typically about an imminent event or something with an uncertain outcome.
Similar:
worried, concerned, apprehensive, fearful, uneasy, ill at ease, perturbed, troubled, disquieted, bothered, disturbed, distressed, fretful,
fretting, agitated, in a state of agitation, nervous, in a state of nerves, edgy, on edge, tense, overwrought, worked up, keyed up, strung out, jumpy, afraid, worried sick
Opposite: carefree, unconcerned