Hello to everyone. I would like a translation for "key to happiness". Thanks in advance.

Possibly -

An riachtanas le sonas a fháil.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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Thank you. Anyone want to verify? This is going on a tattoo so want to double ck.

Perhaps we could paraphrase the title of the old TG4 program "Eochair an Ghrá":

Eochair an tSonais

It's very literal, but I think it might work.

Wait for more input, please.

Redwolf

Yes, there appear to be other examples of similar use in FGB:

eochair eolais "key to knowledge"

Mí na Bealtaine eochair na bliana "(the weather in) the month of May makes or mars the (crops of the) year"

Though Bríd's was probably clearer in meaning, I'll second Redwolf's Eochair an tSonais (or eochair an tsonais without capitalization.)

Subject to further scrunity by others, or course ...

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).