Scotland simply wouldn't fall to Rome OR the Romans just didn't care enough about Scotland to try that hard for it?

which one? why often hear Scottish people saying that it was due to them keeping the Romans from invading them?
Update: AND WHY THAT WOULD BE BTW?

SAME FOR IRELAND TOO? WHY ROMANSY MAYBE DIDNT CARE TOO MUCH FOR IT?
Update 2: I have watched documentaries in past where they are talking about how the Romans built the Antonine wall and just couldn't keep them Scottish people subjugated enough so gave up...true really? or other , why?
6 answers 6