Not belonging to one.
Outside of one's current relationship; unfamiliar.
Not normal; odd, unusual, surprising, out of the ordinary.
Having the quantum mechanical property of strangeness.
Unfamiliar, not yet part of one's experience.
Of an attractor: having a fractal structure.
Sex outside of one's current relationship.
Not assayed or measured in any way.
Not measured for depth, with or as if with a plumb.