The "country" is Thailand and only Thailand. And when it comes to adaptation you are talking to an expert.
Dad was a French Jew, Mum a surviving German. So my mother tongue was German until the age or 4 where I had to adjust to the French school system. After 1967 my Dad couldn't forgive De Gaulle's treason and decided to move to the homeland, so I had to adapt to school in Tel Aviv. (3rd language). In 1981 I emigrated to Australia and blended in effortlessly, mostly thanks to the Sydney community and Australia's true immigration policy.
How about Thailand? IMHO out of 300000 western expats there is a tiny minority who have truly integrated, kudos. There is the tonal language, I am tone death, the abysmal work ethics mother of corruption, the xenophobia that is a key element of the local culture and the gender gap. I just feel I am on a different planet here. Fortunately I have a nice family here. So I avoid the Thai males altogether while I feel that the females a more approachable and respectable.