If you ask a person in Thailand about something and they don’t know the answer – “They smile” – I don’t know if that smile is a reason to sneak away from the problem or it’s a good way to respond to a question they don’t know or it’s simply stupid. If you’re working as a Teacher in Thailand you’ll come across lots of smiles. Students don’t understand much English here and therefore smile.
If you ask a Thai about this they will say:
They’re Buddhist.
They’re generally happy all the time.
They don’t think too much. (Mentally not very strong I’d say)