Based on my experience you can ask for Thai spicy. It also works in Indian restaurants if you ask for Indian spicy. So far I have gotten what I asked for.

My latest experience in my local Indian restaurant resulted in the waiter to double check if we understood what we asked for. Once we got our food he was eyeing us the whole time to see if we would survive haha

[–] teruma@lemmy.world 5 points 1 year ago

My favorite way to order from indian places is "not spicy for child" because otherwise mild is too spicy for me. 🙃