importantly

important +‎ -ly

importantly (comparative more importantly, superlative most importantly)

1. (sentence adverb) Used to mark a statement as having importance.
   • 2009 August 23, Michael Apstein, “Here's to good health - maybe”, in San Francisco Chronicle, page K1:

     These potentially ground-breaking discoveries need to be tempered by the knowledge that very high doses - the equivalent of 100-plus bottles of red wine daily - were given to mice. Importantly, after resveratrol is absorbed into the blood, it is broken down quickly and may have limited effect in humans.

2. In an important manner.
   • 2001 January/February, Frazier, Ian, “Dearly Disconnected.”, in Mother Jones, volume 25, number 1, page 60:

     Even sitting in a restaurant, the person on a cell phone seems importantly busy and on the move.