unembittered

/ˌʌnɪmˈbɪtərd/
adjective
  1. Not feeling or showing bitterness or resentment, especially after a difficult experience.
    • Despite losing the election, she remained unembittered and congratulated her opponent warmly.
    • He was unembittered by years of hardship and still smiled at strangers.
    • The unembittered tone of her memoir surprised readers who expected anger.
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