gotten in to one's head (verb) get: understand
Sinonime: above,
apart,
casual,
chilly,
cold, cold fish,
cool,
detached,
distant, forbidding, hard-boiled, hard-hearted,
haughty, incurious,
indifferent, laid back, lone wolf, loner*, offish, on ice, putting on airs,
reserved,
secluded, solitary, standoffish, stuck up,
supercilious, thick-skinned, unapproachable,
unconcerned,
unfriendly,
uninterested, unresponsive, unsociable, unsympathetic, uppity,
withdrawnAntonime: concerned,
friendly,
sociable