To express oneself with utmost sincerity and thoroughness; to speak with deep earnestness and hold nothing back.
她在告别信中意切辞尽，表达了对大家的感谢和对未来的美好祝愿。
In her farewell letter, she expressed herself with utmost sincerity and thoroughness, conveying her gratitude to everyone and her best wishes for the future.
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