[1] : The Collaborative International Dictionary of English v.0.48

solemn \sol"emn\, a. oe. solempne, of. solempne, l. solemnis,
   solennis, sollemnis, sollennis; sollus all, entire + annus a
   year; properly, that takes place every year; -- used
   especially of religious solemnities. cf. silly, annual.
   1. marked with religious rites and pomps; enjoined by, or
      connected with, religion; sacred.
      1913 webster

            his holy rites and solemn feasts profaned. --milton.
      1913 webster

            the worship of this image was advanced, and a solemn
            supplication observed everry year.    --bp.
                                                  stillingfleet.
      1913 webster

   2. pertaining to a festival; festive; festal. obs. "on this
      solemn day." --chaucer.
      1913 webster

   3. stately; ceremonious; grand. archaic
      1913 webster

            his feast so solemn and so rich.      --chaucer.
      1913 webster

            to-night we hold a splemn supper.     --shak.
      1913 webster

   4. fitted to awaken or express serious reflections; marked by
      seriousness; serious; grave; devout; as, a solemn promise;
      solemn earnestness.
      1913 webster

            nor wanting power to mitigate and swage
            with solemn touches troubled thoughts. --milton.
      1913 webster

            there reigned a solemn silence over all. --spenser.
      1913 webster

   5. real; earnest; downright. obs.  r.
      1913 webster

            frederick, the emperor, . . . has spared no expense
            in strengthening this city; since which time we find
            no solemn taking it by the turks.     --fuller.
      1913 webster

   6. affectedly grave or serious; as, to put on a solemn face.
      "a solemn coxcomb." --swift.
      1913 webster

   7. law made in form; ceremonious; as, solemn war;
      conforming with all legal requirements; as, probate in
      solemn form. --burrill. --jarman. --greenleaf.
      1913 webster

   solemn league and covenant. see covenant, 2.
      1913 webster

   syn: grave; formal; ritual; ceremonial; sober; serious;
        reverential; devotional; devout. see grave.
        1913 webster
see also:
silly annual solemn league and covenant covenant grave 

[2] : WordNet (r) 2.0

solemn
     adj 1: dignified and somber in manner or character and committed to
            keeping promises; "a grave god-fearing man"; "a quiet
            sedate nature"; "as sober as a judge"; "a solemn
            promise"; "the judge was solemn as he pronounced
            sentence" syn: grave, sedate, sober
     2: characterized by a firm and humorless belief in the validity
        of your opinions; "both sides were deeply in earnest, even
        passionate"; "an entirely sincere and cruel tyrant"; "a
        film with a solemn social message" syn: earnest, in
        earnestp, sincere
see also:
grave sedate sober earnest in earnestp sincere 

[3] : Moby Thesaurus II by Grady Ward, 1.0

213 moby thesaurus words for "solemn":
   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

Solemn >> S Words
Solemn, definition of term: Solemn
solemn_pag1.html

Solemn League A >> S Words
Solemn League A, definition of term: Solemn League A
solemn+league+a_pag1.html