/ ˈθæŋkfəli; NAmE / adverb
1.
used to show that you are pleased that sth good has happened or that sth bad has been avoided
SYN fortunately :
There was a fire in the building, but thankfully no one was hurt.
2.
in a pleased or grateful way :
I accepted the invitation thankfully.
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WORD ORIGIN
Old English thancfullīce (see thankful , -ly ).