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Webster 1828 Edition

adv.

Really; in sincerity; without disguise; without attempting to produce false appearances. He was unaffectedly cheerful.

unaffectedly ‎(comparative more unaffectedly, superlative most unaffectedly)

In an unaffected manner. Sincerely and genuinely. Not artificially
- 2007 Nov. 7. Alfred Hickling review of The Adoption Papers in The Guardian.
  Lisa Livingstone as Molly gives the kind of unaffectedly natural performance you would happily watch until the cows come home.