worried stiff

Your mother is worried stiff about you and you're coming back with us and coming now.

One day Marster Buck comes in, an' we sees dat he am worried stiff; atter awhile he gangs us up, an' sez ter us: De Yankees am a-comin' to take my slaves 'way from me an' I don't 'pose dat dey am gwine ter do dat.

She was just worried stiff for fear she'd catch somethin'.

"He's worried stiff about it."

These other poor devils, worried, stiff, strumous, awkward, vapid, and rather coarse, with here and there a passably pretty woman, are European kings, queens, grand-dukes, and the like.