
Adieu
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.
Formal Tone
'Adieu' has a formal, poetic, or old-fashioned tone in English.

They bade adieu with a formal handshake.
Predominantly French
While it's used in English, it's originally French and can sound sophisticated.

He whispered 'adieu' with a perfect French accent.
Compare with
ByeCiaoFarewellGoodbyeSo long
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