From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unaffected \Un`af*fect"ed\, a.
1. Not affected or moved; destitute of affection or emotion;
uninfluenced.
[1913 Webster]
A poor, cold, unspirited, unmannered,
Unhonest, unaffected, undone fool. --J. Fletcher.
[1913 Webster]
2. Free from affectation; plain; simple; natural; real;
sincere; genuine; as, unaffected sorrow.
[1913 Webster] -- Un`af*fect"ed*ly, adv. --
Un`af*fect"ed*ness, n.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
unaffected
adj 1: undergoing no change when acted upon; "entirely
unaffected by each other's writings"; "fibers remained
apparently unaffected by the treatment" [ant: affected]
2: unaware of or indifferent to; "insensible to the suffering
around him" [syn: {insensible(p)}, {unaffected(p)}]
3: emotionally unmoved; "always appeared completely unmoved and
imperturbable" [syn: {unmoved(p)}, unaffected, untouched]
[ant: affected, {moved(p)}, stirred, touched]
4: free of artificiality; sincere and genuine; "an unaffected
grace" [ant: affected, unnatural]