Staid \STAYD\, adjective:
Steady or sedate in character; sober; composed; regular; not wild, volatile, or fanciful.

After the founders have left or died, after the excitement has moved elsewhere along with the best employees, after the company’s products and logo and image have grown synonymous with staid and predictable.
— Michael S. Malone, Infinite Loop

His mother being, in fact, a rather staid English country lady of mild habits and genteel aspirations.
— Lesley Hazleton, Driving To Detroit

He took no interest in artistic pursuits, and in time became a staid businessman like his father — a bank manager; in fact, utterly middle class.
— Patrick McGilligan, Fritz Lang: The Nature of the Beast

Staid is from obsolete staid, past participle of stay.

Dictionary.com Entry and Pronunciation for staid

OK, I hate to start posting again with such a lame entry, but there really wasn’t anything neat, and I didn’t want to post any AMVs and apprently staid is a common misspelling of Staind. This is just weird. At least it is somewhat original. He just kind of sits there. God, I hate performance art, I hope you enjoy the music at least.

Feel the link.