serpentine

Of or resembling a serpent, as in form or movement; sinuous.

Subtly sly and tempting.

Relating to or derived from serpentine or soil containing serpentine.

Any of a group of greenish, brownish, or spotted minerals, Mg₃Si₂O₅(OH)₄, used as a source of magnesium and asbestos, and in architecture as a decorative stone.

To wind like a serpent; move sinuously like a snake; meander; wriggle.

In mathematics: The surface generated by a sphere whose center travels along a helix.

A special curve of the third order.

Of or pertaining to or resembling a serpent.

Especially—

Having or resembling the qualities or instincts ascribed to serpents; subtle; cunning; treacherous or dangerous.