Solemnly

Adverb

 * 1) In a solemn manner.

Thesaurus
bleakly, ceremoniously, decorously, demurely, dismally, drearily, earnestly, formally, funereally, gloomily, grandly, gravely, grimly, heavily, imposingly, in due form, in set form, loftily, magisterially, majestically, nobly, pro forma, regally, ritualistically, ritually, royally, sadly, sedately, seriously, sober-mindedly, soberly, sobersidedly, somberly, sombrously, staidly, stately, thoughtfully, venerably, with dignity, worthily

Translations

 * Esperanto: solene