Solemn1. (a.) Marked with religious rites and pomps; enjoined by, or connected with, religion; sacred.
2. (a.) Pertaining to a festival; festive; festal.
3. (a.) Stately; ceremonious; grand.
4. (a.) Fitted to awaken or express serious reflections; marked by seriousness; serious; grave; devout; as, a solemn promise; solemn earnestness.
5. (a.) Real; earnest; downright.
6. (a.) Affectedly grave or serious; as, to put on a solemn face.
7. (a.) Made in form; ceremonious; as, solemn war; conforming with all legal requirements; as, probate in solemn form.
Thesaurus Entries
Christian, Christianlike, Christianly, admiring, adorant, adoring, apotheosizing, arid, aristocratic, august, awe-inspiring, awed, awesome, awestricken, awestruck, barren, believing, black, blah, blank, bleak, bloated, bloodless, bombastic, celebrating, celebrative, ceremonial, ceremonious, characterless, cold, colorless, commemorating, commemorative, conventional, courtly, cultish, cultist, cultistic, dark, dead, decorous, deifying, demure, devoted, devotional, devout, dignified, dismal, divine, draggy, drear, drearisome, dreary, dry, dryasdust, dull, dusty, dutiful, earnest, ecclesiastical, effete, elephantine, elevated, empty, etiolated, fade, faithful, fatal, fateful, flat, flatulent, formal, formidable, frowning, full, funebrial, funereal, gassy, gloomy, glum, grand, grandiloquent, grave, gray, grim, grim-faced, grim-visaged, hallowed, heavy, hero-worshiping, hieratic, ho-hum, hollow, holy, idolatrous, idolizing, imploring, important, imposing, impressive, in awe, in the dust, inane, inexcitable, inflated, insipid, inspiring, jejune, kingly, leaden, lifeless, liturgic, liturgical, lofty, long-faced, lordly, low-spirited, magisterial, magnificent, majestic, memorial, mirthless, moderate, momentous, morbid, morose, moving, no-nonsense, noble, on bended knee, ostentatious, overwhelming, pale, pallid, pedestrian, pietistic, pious, plenary, plodding, pointless, poky, pompous, ponderous, pontifical, portentous, prayerful, precative, precatory, princely, prostrate before, queenly, regal, religious, reserved, reverent, reverential, ritual, ritualistic, royal, sacerdotal, sacramental, sacred, saturnine, sedate, self-important, serious, slow, sober, sober-minded, sobersided, somber, sombrous, spiritless, staid, stately, statuesque, sterile, stiff, stilted, stodgy, stone-faced, straight-faced, stuffy, sublime, superficial, suppliant, supplicant, supplicatory, swollen, taciturn, tasteless, tedious, temperate, theistic, thoughtful, triste, tumid, turgid, unlively, unsmiling, vapid, venerable, venerational, venerative, weariful, wearisome, weary, weighty, well-mannered, wooden, worshipful, worshiping, worthy