This is fordhaonna in Quo Vadis (neart fordhaonna)
Dinneen says under for- that this is pronounced fór- when attached to a word of 2 or more syllables. Is this /'fo:r-ˌɣe:nə/ with a primary and secondary stress as shown, or the other way round?

Double stress, i.e., as if it were two separate words.

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WARNING: Intermediate speaker - await further opinions, corrections and adjustments before acting on my advice.
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect.
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), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Thank you.