adjective
honest, unsophisticated
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
adjective
unchanged, unmoved
Synonyms: 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
Antonyms: affected, changed, moved, unnatural