no stranger to

acquainted aware conversant

savvy versant

abreast apprised at home with au courant au fait cognizant conscious grounded in on in the know informed introduced kept posted mindful plugged in tuned-in up up on versed in well up in with it

ignorant

aloof cold cool distant foreign new reserved strange unacquainted unapproachable uncommon undistinguished unfamiliar unfriendly unknowledgeable unknown unremarkable

savvy versed

abreast acquainted apprised at home with au courant au fait aware cognizant conscious conversant grounded in on in the know informed introduced kept posted mindful plugged in tuned-in up up on versed in well up in with it