unaffected

Synonyms: artless candid direct folksy forthright frank genuine guileless homey ingenuous modest naive natural plain simple sincere single spontaneous straightforward true unartificial unassuming unpretentious unschooled unspoilt unstudied up front

Antonyms: refined sophisticated unnatural

Synonyms: aloof callous calm casual cold fish cool easygoing hard-boiled hard-hearted impassive impervious laid-back not influenced proof steady thick-skinned unaltered unconcerned unexcited unimpressed uninfluenced unresponsive unruffled unstirred untouched

Antonyms: affected changed moved unnatural