Yes
Upset can be either an antonym or a synonym. Flustered would be a synonym. Calm would be an antonym. Since upset can be a noun, verb or an adjective, There could three answers for each!
agitation, apprehension, hassle, panic, upset, bewilderment
upset, worried, troubled, distracted, tormented, distraught, agitated, wretched
trouble. agitate. commove. interrupt. touch. upset. vex.
Yes.
Yes
Upset can be either an antonym or a synonym. Flustered would be a synonym. Calm would be an antonym. Since upset can be a noun, verb or an adjective, There could three answers for each!
agitation, apprehension, hassle, panic, upset, bewilderment
upset, worried, troubled, distracted, tormented, distraught, agitated, wretched
Strife is a synonym for fight or argument.
trouble. agitate. commove. interrupt. touch. upset. vex.
unhappy; upset; bleak; pessimistic; harsh; severe; dour; dismal; gloomy
angry, furious, irate, mad, livid, upset, angered, boiling, infuriated
Tremble, quiver, shudder, agitate, rattle, upset, distress, undermine, weaken...
Getting upset unreasonably about something or someone. A childish rage. A ostentatious display of bad temper.
Irritable applies to an individual who is easily irritated, as in disturbed, upset, or angered. A synonym could be cranky, irascible, disagreeable, or ill-tempered.