Any help would be much appreciated on this, I'm trying to translate "I have secrets that I can't tell"

Would it be something like:
"Tá rúnaí agam a níl mé ábalta insint"?
"-níl mé in ann insint"?

That's probably far too simple, isn't it...
Thanks, guys!

Tá rúnaí agam "I have a secretary" (Half your luck, mate - I have to do all my own paperwork.)

rún "a secret"
rúin "secrets"

To turn níl mé in ann into a modifier change níl to nach bhfuil.

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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).

Tá rúin agam nach féidir liom a scaoileadh.

More 'divulge' than 'tell' - but rún a insint doesn't sound 100% to me???

I thought exactly the same thing, but wasn't sure what it should be.

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Hahaha why did I write rúnaí!? Brilliant!
Thanks for the suggestions. On a similar note, how could I say "I can't tell", as in "I'm not allowed to tell" in answer to a question?

Cheers guys!

I just found the following on RosnaRun's official twitter if it changes anybody's opinion on my choice of "insint"?

"An bhfuil Al ag insint rúin faoi Dhara do Chaitríona?"