Staid often has a slightly negative tone, suggesting dullness and lack of excitement. The dinner party was rather staid, with very formal conversation.
Pro Tip 2/3
Older Generations
Staid can imply traits associated with older people who are resistant to change. My grandfather has staid values that he's not willing to reconsider.
Pro Tip 3/3
Formal Contexts
Use 'staid' to describe environments or events that are formal and resist anything improper. The gala was a staid affair, with everyone strictly following etiquette.