noun

Anxiety or fear that something bad or unpleasant will happen.

he felt sick with apprehension

anxiety,angst,alarm,worry,uneasiness,unease,nervousness,misgiving,disquiet,concern,agitation,restlessness,edginess,fidgetiness,nerves,tension,trepidation,perturbation,consternation,panic,fearfulness,dread,fear,shock,horror,terror