Not formal or ceremonious.
Reflecting everyday, non-ceremonious usage.
Suited for everyday use.
Not in accord with the usual regulations.
Not organized; not structured or planned.
Characterized by or performed with appropriate or great ceremony or formality.
Of or pertaining to religious ceremonies and rites; (generally) religious in nature; sacred.
Inspiring serious feelings or thoughts; sombrely impressive.
Deeply serious and sombre; grave.