stiff as a board

stiff as a board

Also, stiff as a poker. Inflexible, rigidly formal, unbending, as in This cloth is stiff as a board; what happened to it? or There he stood, stiff as a poker, unwilling to give an inch. The board in the first simile for rigidity is a slab of wood; the second, alluding to the iron implement used to push around logs in open fires, dates from the late 1700s.
See also: board, stiff

stiff as a board

If you or your body are as stiff as a board, you are very stiff. You'll achieve flexibility very quickly with these exercises — even if you're as stiff as a board at your first session. His lower back felt as stiff as a board.
See also: board, stiff

(as) stiff as a ˈboard

(of things) very firm and difficult to bend or move: He left his gloves outside in the snow, and when he found them again they were as stiff as a board.
See also: board, stiff
References in classic literature ?
Both Summerlee and Challenger were limping heavily, while I still dragged my feet from weakness after the shock of the morning, and my neck was as stiff as a board from the murderous grip that held it.
But he found the hide had dried as stiff as a board, and as he knew naught of tanning, he was forced to abandon his cherished plan.