demure (adj.)

• backward
• bashful
• censorious
• close
• confused
• conscious
• coy
• decent
• decorous
• diffident
• earnest
• formal
• frowning
• grave
• grim
• hidebound
• inarticulate
• long-faced
• modest
• mousy
• narrow
• nice
• old-maidish
• overmodest
• priggish
• prim
• proper
• prudish
• puritanical
• reserved
• reticent
• retiring
• sanctimonious
• sedate
• seemly
• self-conscious
• serious
• shamefaced
• shy
• silent
• skittish
• smug
• sober
• sobersided
• solemn
• somber
• staid
• stiff-necked
• straitlaced
• stuffy
• thoughtful
• timid
• timorous
• unassertive
• unassured
• unsmiling
• weighty