1. Upset, capsize, overturn imply a change from an upright or other stable position to a prostrate one. Upset is a familiar word, applied to simple, everyday actions: to upset a table, a glass of water. Capsize is applied especially to the upsetting of a boat or other vessel: to capsize a canoe. Overturn usually suggests violence in upsetting something supposedly stable: The earthquake overturned houses. All three are used figuratively, also: to upset the stock market; to capsize a plan; to overturn a government. 2. unnerve, disconcert, fluster. 5. depose, displace. 10. perturbation, disturbance. 11. mess. 15. disconcerted, agitated, perturbed, annoyed.