Of little weight or importance; not worth notice; slight; trivial.
Having no reasonable prospect of success because its claim is without merit, lacking a supporting legal or factual basis, while the filing party is, or should be, aware of this.
Silly, especially at an inappropriate time or in an inappropriate manner.
Evasive; difficult to pin down.
Unstable; changeable; inconstant.
Of a surface, having low friction, often due to being covered in a non-viscous liquid, and therefore hard to grip, hard to stand on without falling, etc.