WordNet sense 1 (people who are defeated):

defeated

WordNet sense 2 (disappointingly unsuccessful):

disappointed, frustrated, thwarted, foiled

WordNet sense 3 (not successful; having failed or having an unfavorable outcome):

unsuccessful

WordNet sense 4 (caused to feel self-conscious and uncomfortable):

embarrassed

WordNet sense 5 (conducive to or feeling mental discomfort):

uncomfortable