Breandán wrote:
"Invictus" is a short Victorian poem by the English poet William Ernest Henley. The Latin "Invictus" means "unconquered" or "unconquerable". How would you express this in Irish?
Perhaps:
Dochloíte
Any other suggestions?
De Bhaldraithe has 'dochloite', 'dosháraithe' and 'dobhuailte' for 'unbeatable'. Also, 'ni raibh fear a bharrtha ann' - 'he was unbeatable'. I have no personal wisdom to impart.

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Is foghlaimeoir mé. I am a learner. DEFINITELY wait for others to confirm and/or improve.
Beatha teanga í a labhairt.