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Adjective: staid (staider,staidest)  steyd
  1. Characterized by dignity and propriety
    - sedate
  2. Excessively conventional and unimaginative and hence dull
    "why is the middle class so staid, so utterly without a sense of humour?";
    - stodgy, stuffy

Sounds like: staff, staid

Derived forms: staider, staidest

See also: button-down, buttoned-down [US, informal], conservative, conventional, decorous