THANKFULLY
thankfully
(adverb) let us be thankful that; “thankfully he didn’t come to the party”
thankfully, gratefully
(adverb) in a thankful manner; with thanks; “he accepted thankfully my apologies”
Source: WordNet® 3.1
Etymology
Adverb
thankfully (comparative more thankfully, superlative most thankfully)
In a thankful manner; giving thanks.
(sometimes proscribed) fortunately, gratefully.
Source: Wiktionary
THANKFUL
Thank"ful, a. Etym: [AS. Þancfull.]
1. Obtaining or deserving thanks; thankworthy. [R.]
Ladies, look here; this is the thankful glass That mends the looker's
eyes; this is the well That washes what it shows. Herbert.
2. Impressed with a sense of kindness received, and ready to
acknowledge it; grateful.
Be thankful unto him, and bless his name. Ps. c. 4.
– Thank"ful*ly, adv.
– Thank"ful*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition