I'm not sure if they were more solemn than the other groups, but in my mind's eye they are stoic and solemn.
Injured veterans came to Crawford, Texas, for a mountain-bike race on a solemn holiday.
No putdowns, no jokes, no frivolity whatever—he was most solemn and his eyes focused somewhere far beyond the back of my head.
mid-14c., "performed with due religious ceremony or reverence, sacred, devoted to religious observances," also, of a vow, etc., "made under religious sanction, binding," from Old French solempne (12c., Modern French solennel) and directly from Latin sollemnis "annual, established, religiously fixed, formal, ceremonial, traditional," perhaps related to sollus "whole" (see safe (adj.)).
"The explanation that Latin sollemnis was formed from sollus whole + annus year is not considered valid" [Barnhart], but some assimilation via folk-etymology is possible. In Middle English also "famous, important; imposing, grand," hence Chaucer's friar, a ful solempne man. Meaning "marked by seriousness or earnestness" is from late 14c.; sense of "fitted to inspire devout reflection" is from c.1400. Related: Solemnly.