let one hair down (verb) play: have fun
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uninterested, unresponsive, unsociable, unsympathetic, uppity, withdrawn
Antonime: concerned,
friendly,
sociable