Placid It is indeed a language isolate, pre-dating Indo-European. It is reckoned that the Basques are the closest living relatives to Cro-magnon man. We had to learn a bit of Basque when I lived in Azpeitia,, in Gipuzkoa. If you want to have a nice basic conversation you can have a go at the following:
Zer Moduz?
Ondo. Eta zu?
Oso ondo, eskerrik asko!
How are you?
Fine. And you?
Very well, thank you!
If you've never been to the Pais Vasco, do yourself a favour. Beautiful place, lovely people: https://tourism.euskadi.eus/en/gipuzkoa/aa30-12375/en/