sliding

Slippery; uncertain; unstable; changing.

Movable; graduated; varying; changing according to circumstances: as, a sliding scale (which see, under slide, v.).

That slides; fitted for being slid.

Sloping.

noun

The motion of a body along a plane when the same face or surface of the moving body keeps in contact with the surface of the plane: thus distinguished from rolling, in which the several parts of the moving body come successively in contact with the plane on which it roils.

noun

The sport of gliding on snow or ice, on the feet, on a sled or a toboggan, or (in former use) on skates, etc.

noun

Falling; lapse; merging.

noun

Transgression; lapse; backsliding.

adjective

That slides or slips; gliding; moving smoothly.

adjective

Slippery; elusory.