decorous (adj.)

• accepted
• acknowledged
• appropriate
• approved
• becoming
• befitting
• ceremonial
• ceremonious
• civil
• civilized
• comely
• condign
• conformable
• conforming
• conventional
• correct
• customary
• decent
• delicate
• demure
• dignified
• done
• due
• earnest
• elegant
• felicitous
• fit
• fitting
• formal
• frowning
• genteel
• gentlemanly
• good
• grave
• grim
• happy
• hieratic
• kosher
• ladylike
• long-faced
• mannerly
• meet
• modest
• nice
• normal
• normative
• orthodox
• polished
• polite
• pompous
• prim
• proper
• punctilious
• received
• recognized
• refined
• respectable
• right
• righteous
• rightful
• rigid
• ritual
• ritualistic
• sacerdotal
• seasonable
• sedate
• seemly
• serious
• sober
• sobersided
• solemn
• somber
• staid
• stately
• stiff
• stuffy
• suitable
• thoughtful
• traditional
• unsmiling
• urbane
• weighty
• well-behaved
• well-mannered