My uncle died recently and my family are looking for an inscription as Gaeilge for the headstone.
They're looking for something along the lines of "in our hearts forever". Now, the literal translation would be "in ár gcroíthe go deo" but i feeel like theres a less literal one that has something to do with "cuisle" but i could be wrong

GRMA in advance for the help

inár gcroí go deo
inár gcroí go deo

inár, "in our", in one word,
(g)croí, heart, the singular form is preferred here in Irish, croíthe is plural.

There are a few threads already with the same question which might have additional information:
https://irishlanguageforum.com/viewtopi ... 190#p49383
viewtopic.php?f=28&t=7245&hilit=in%C3%A1r+gcro%C3%AD

Cuisle is a term of endearment, usually in addressing, a chuisle, "my pulse", or a chuisle mo chroí ("pulse of my heart")
I don't know if it's suitable for gravestones.

I can second this offering by Labhrás. Definitely better with the singular croí, not the plural croíthe.

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[hr]Múinteoir Gaeilge - Irish Teacher[/hr]
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).