Definify.com

Webster 1828 Edition

adv.

With a due sense of benefits or favors; in a manner that disposes to kindness, in return for favors. The gift was gratefully received.

In a pleasing manner. Study continually furnishes something new, which may strike the imagination gratefully.

gratefully ‎(comparative more gratefully, superlative most gratefully)

In a grateful manner.
- 1963, Margery Allingham, chapter 5, in The China Governess:
  A waiter brought his aperitif, which was a small scotch and soda, and as he sipped it gratefully he sighed.
  ‘Civilized,’ he said to Mr. Campion. ‘Humanizing.’ […] ‘Cigars and summer days and women in big hats with swansdown face-powder, that's what it reminds me of.’