Webster's Revised Unabridged Dictionary · 1913

Staid

Staid (stād) , imperfect and past participle

imp. & past participle of Stay.

Staid , adjective

[From Stay to stop.]

Sober; grave; steady; sedate; composed; regular; not wild, volatile, flighty, or fanciful.
Sober and staid persons. — Addison
O'erlaid with black, staid Wisdom's hue. — Milton