open can of worms (verb) complicate: confuse, make difficult
Sinonime: aloof, callous,
calm,
casual, cold fish, cool, easy-going, hard-boiled, hard-hearted,
impassive,
impervious,
laid-back*, not influenced,
proof,
steady, thick-skinned, unaltered, unconcerned, unexcited, unimpressed, uninfluenced, unresponsive, unruffled, unstirred, untouched
Antonime: affected,
changed,
moved,
unnatural