alien
/ˈeɪliən/
adjective
Belonging to a foreign country or nation.
This is blundering on foreign soil in an alien culture which they fail to grasp and arrogantly underestimate and they will ultimately pay the price of their ignorance.
foreign,overseas,non-native,external,distant,remote
noun
A foreigner, especially one who is not a naturalized citizen of the country where they are living.
an illegal alien
foreigner,foreign national,non-native,immigrant,emigrant,émigré,incomer,newcomer,visitor,outsider,stranger