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Adjective: fastuous  fas-choo-us
Usage: archaic
  1. Having or showing arrogant superiority to and disdain of those one views as unworthy
    "His fastuous attitude alienated his colleagues";
    - disdainful, haughty, imperious, lordly, overbearing, prideful, sniffy [informal], supercilious, swaggering, orgulous [archaic], toplofty [US, informal]

See also: proud