1) Artless 2) Indifferent 3) Modest 4) Naif 5) Naive 6) Natural 7) Real 8) Sincere 9) Uncontrived 10) Unimpressed 11) Uninfluenced 12) Unmoved 13) Unselfconscious 14) Unstilted 15) Unstudied 16) Unswayed 1) Emotionally unmoved 2) Free from affectation 3) Free of artificiality 4) Immune 5) Sincere 6) Sincere and genuine 7) Superior 8) Unaware of or indifferent to 9) Unbothered 10) Unimpressed 11) Uninfluenced 12) Unmovable 13) Unmoved 14) Unswayed 15) Untouched 
• (a.) Not affected or moved; destitute of affection or emotion; uninfluenced. • (a.) Free from affectation; plain; simple; natural; real; sincere; genuine; as, unaffected sorrow.
[adj] - free of artificiality 2. [adj] - undergoing no change when acted upon
adjective undergoing no change when acted upon; `entirely unaffected by each other`s writings`; `fibers remained apparently unaffected by the treatment`
free from affectation; sincere; genuine: The man showed unaffected grief at the death of his former opponent. · unpretentious, as a personality or literary style.
free of artificiality; sincere and genuine[Intelligent words] free of artificiality; sincere and genuine