Etymology
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staid (adj.)

1540s, "fixed, permanent," adjectival use of stayed, past participle of stay (v.). Meaning "sober, sedate" first recorded 1550s. As in Philip Sidney's justice staid, explained by Ruskin as "The desire of what is just, being stayed or restrained within the limits of what can be accomplished by just means." Related: Staidly.

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Definitions of staid

staid (adj.)
characterized by dignity and propriety;
Synonyms: sedate
From wordnet.princeton.edu