Adieu
Definition 1 of 2
Pro Tip 1/3
Parting Sentiment
Used when expecting not to see someone again for a long time or ever. As she boarded the train, she called out 'adieu' to her family on the platform.
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Formal Tone
'Adieu' has a formal, poetic, or old-fashioned tone in English. They bade adieu with a formal handshake.
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Predominantly French
While it's used in English, it's originally French and can sound sophisticated. He whispered 'adieu' with a perfect French accent.