the.com/solemn
The face you make when laughing would get you disinherited.
means Formal, serious, and weighty in a dignified, often ceremonial way, with no room for levity.
from From Latin sollemnis, meaning yearly or ceremonial, tied to religious rites that recurred on fixed, sacred dates.
Legal weightA solemn oath is one law treats as binding.
Music markingComposers use solemne to demand slow, grave performance.
Root twistOriginally meant regular, not sad or grim.