Thankfully

adv.joyful, hopefulwarm

Meaning 1

With conscious gratitude.

Reach for it when describing an action or response performed in a grateful spirit

She thankfully accepted the dry clothes offered by the rescue team.

everyday
with thanks
when a concise closing or acknowledgment is needed
not when The phrase is too formulaic for a vivid account of someone's gratitude.
warm
gratefully
when the person's felt appreciation is central
not when Gratefully cannot normally introduce a fortunate event without a person doing the feeling.
professional
appreciatively
when recognition of effort is visible but restrained
not when Appreciatively sounds observational and may underplay heartfelt thanks.

As a welcome indication that an undesirable outcome was avoided.

Reach for it when introducing good news or relief about what happened

Thankfully, the backup pump started before water reached the archive.

everyday
luckily
when chance prevented trouble and an informal tone fits
not when Luckily can trivialize a serious escape or imply chance when planning caused the result.
everyday
to our relief
when the emotional release should be explicit
not when This phrase centers relief, not gratitude for help or good fortune.
warm
happily
when the welcome fact can sound light and positive
not when Happily may suggest cheer rather than relief and can confuse the manner and sentence-adverb senses.
professional
fortunately
when good luck or a favorable outcome is the point
not when Fortunately is emotionally neutral and does not signal anyone's gratitude.
literary
mercifully
when relief from suffering deserves strong emotional emphasis
not when Mercifully is too dramatic for a small convenience.

smile thankfully
She smiled thankfully when the missing notebook was returned.
thankfully accept
The family thankfully accepted a room while their heating was repaired.
thankfully no one
Thankfully no one was inside the workshop when the roof panel fell.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.